Father of atomic theory
a negative Subatomic particle
Same number of protons but different neutrons
a positive charged subatomic particle
the energy needed to take an electron from an atom
a neutral subatomic particle
an atoms ability to attract an electron
can not be broken down into simpler substances
half the distance between the centers of two atoms that are touching each other
a family with a group of elements with similar properties
Group 17 salt former
most reactive of all metals
the number of protons of an atom
created the visual model of an atom
J.J Thomson Created used blank to prove that atoms can be broken into smaller parts
composed of two or more elements
a characteristic that can be observed without changing into another substance
a characteristic that describes the ability to change into different substances
used the gold foil experiment
Number of protons in the nucleus of an atom
A stable subatomic particle
A cloudlike group of electrons
A substance consisting of atoms which all have the same number of protons
The time required for a quantity to reduce to half its initial value
Any one of various forms in which the atoms of a chemical element can occur
The total number of protons and neutrons in a nucleus
A subatomic particle of about the same mass as a proton but without an electric charge
A very small particle of matter that is part of the nucleus of an atom and that has a positive electrical charge
A solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity
An element or substance that is not a metal
A nonmetal that can combine with a metal to form an alloy
The smallest particle of a substance that can exist by itself or be combined with other atoms to form a molecule
The negatively charged particle in the electron cloud.
A particle in the nucleus that is positively charged
A particle in the nucleus with a neutral, or no charge
A tiny, dense positively charged region in the center of an Atom
Particles, like protons, neutrons, and electrons that are smaller than atoms
Regions inside the Atom where electrons are likely to be found. This model developed by Schrodinger, is called Quantum Theory
The number of protons in an element
The average of the masses the neutrally occurring isotopes in element
The arrangement of elements on a table based on their atomic number
A column on the periodic table, also called a family containing elements with the same number of Valence electrons
one of a hundred or so pure substances that cannot be broken down into simpler substances
A particle with a positive charge
A particle with no charge
A particle with a negtive charge
Atoms with the same number of protons, but different number of neutrons
The number of protons in the nucleus
The number of protons and neutrons in an atom
A material that has shininess, conductivity, magnetism, malleability, and ductility
Ability to transfer heat or electricity
Ability to be pulled into wires
Ability to be hammered into shapes
An element that lacks the characteristics of a metal
An element intermediate in properties of a metal and non metal
the first element on the periodic table
Not discovered in nature, but artificially produced isotopes
What hydrogen and helium would make, if combined
The 14th element on the periodic table
Electrons in the outermost shell of an atom that are used for chemical bonds
Made up of atoms, and defined nthe number of protons in the nucleus
the 8th element on the periodic table
What lithium and helium make when combined
The smallest unit of an element that maintains the properties of that element.
A subatomic particle that has no change and that is found in the nucleus of an atom.
A region around the nucleus of an atom whose electrons are likely to be found.
A unit of mass that describes the mass of an atom or molecule.
An atom's central region, which is made up of protons and neutrons.
An atom that has the same number of protons/atomic number as other atoms of the same element do but that has a different number of neutrons/atomic mass.
The mass of an atomn expressed in atomic mass units.
A subatomic particle that has a positive charge and that is found in the nucleus of an atom.
A subatomic particle that has a negative charge.
The sum of the number of protons and neutrons in the nucleus of an atom.
The number of protons in the nucleus of an atom; the atom's number is the same for all atoms of an element.
Plays in radioactive atoms that changes a neutron to a proton or electron.
A type of physical that occurs between electrically charged particles.
The force that holds particles together in the atomic nucleus.
A force that attracts any objects with mass.
The "outer energy shell" of and atom
Electrons are "shared" in this type of bond.
Electrons are "stolen" in this type of bond.
The smallest unit of matter with all the properties of that substance.
This matches the number of protons in an atom.
A neutron has a ___________________ charge.
"Like" electric charges ____________________ each other.
A combination of one or more atoms.
The location around the nucleus where electrons orbit.
A charged particle.
A "Family" of elements that do not typically react with other elements.
The "Family" of elements that are very reactive.
Characteristics that are measurable or observable are called physical _____________.
Subtract the atomic number from the atomic mass to find the number of _________________.
Electrons have a ______________________ charge.
Protons have a _________________________ charge.
An abreviated way to name an element.
Other than hydrogen and helium, the number of electrons needed to fill the valence shell.
The center of an atom where the protons and neutrons are located.
An element that can have a variable number of neutrons in its nucleus.
Atoms with full outer energy shells are known to be _______________.
A group of elements with similar properties are known as a _________________.
Reactivity is a ______________________ property.
The elements are organized into this grid.
When elements react they form new _____________________.
This element is found in all organic matter and has four valence electrons.
NaCl is the ___________________________ for salt.
Each ___________________ on the periodic table represents the number of valence electrons in an element.
Each __________ on the Periodic Table represents the number of "energy levels" an element has.
The "electronic connections" between elements in a molecule.
A particle with a single negative charge
The positively charged central part of an atom
A positively charged particles that make up a nucleus
A nuetral particle in the nucleus of an atom
The electrons in the outermost energy level of Niels Bohr's model of an atom
An area around an atomic nucleus where an electron is most likely to be found
Pure substances that cannot be broken down into any simpler substances
The number of protons in an atom of an element
Atoms of the same element that have different numbers of neutrons
The sum of the number of protons and neutrons in an atom
The average mass of an element's isotopes
A chart of elements arranged into rows and columns based on their chemical and physical properties
Vertical columns on the periodic table
Horizontal rows on a Periodic Table
A group located on the left side of the Periodic Table that is a good conductor and shine when polished
Another group located on the right side of the Periodic Table that are insulators and are not shiny
An object that has low electrical resistance and can allow electricity to flow easily
An object that has higher electrical resistance and prevents electricity easily through a material
Elements in the middle of the Periodic Table and are semiconductors.They also have properties that are similar to both metals and nonmetals
A substance that is made of two or more elements chemically joined in a specific combination
An atom no longer neutrally charged because it has lost electrons
An attraction that holds ions close together
A bond formed when two atoms share valence electrons
A chemical reaction that releases heat of light energy
Chemical Reactions that absorb energy
The speed at which a reaction occurs
A substance that speeds up chemical reactions
A change in matter that produces new substances with new properties. (2words)
New substances produced in a chemical reaction.
Substances that react together in a chemical reaction.
A system for organizing elements into columns and rows based on their properties. (2words)
Rows in the periodic table.
Columns in the periodic table.
A group of letters and subscript numbers that represent the make-up of a chemical compound. (2words)
An atom that has an electrical charge, either positive or negative.
A compound that forms between a metal and a non-metal after electrons are transferred.
A compound that forms between non-metals as they share electrons.
A subatomic particle found in the nucleus of an atom. It has no charge.
A positively charged subatomic particle found in the nucleus of the atom.
A negatively charged subatomic particle that orbits the nucleus of an atom.
Refers to either the outer orbital of an atom or the electrons found in the outer shell.
A reaction in which two or more reactants combine to produce a new product.
A reaction in which one compound breaks down into two or more simpler compounds.
A reaction in which one element takes the place of another element in a compound. (2words)
A reaction in which the metal ions of two different compounds exchange places. (2words)
The smallest unit of an element.
A compound that tastes sour, corrodes metal and tissue, and turns blue litmus paper red.
A substance that changes colour when added to an acid or a base.
A compound that tastes bitter, feels slippery, corrodes tissue, and turns red litmus paper blue.
The number in front of a product or reactant in a balanced chemical equation.
Ability to conduct (transfer) electricity.
Law describing the fact that the total mass and number of atoms is the same before and after a reaction. (3words)
A reaction between an acid and a base that produces salt and water.
Elements on the left side of the periodic table. They are malleable, shiny, conductive, and solid at room temperature.
Elements on the right side of the periodic table. They are not malleable, not conductive, and exist in a number of states at room temperature.
A pure substance that cannot be broken down.
A pure substance that contains two or more different elements.
are the building blocks of matter
Neutrons and Protons are located here
Positively charged particles
Particles that have no charge
Negitively charged particles
pure substances that cannot be broken down into other substances by physical or chemical means
Atoms of the same element that have different numbers of neutrons
A pure substance formed when two or more different elements combine
chemical bond that forms when electrons are shared
a compound in which the atoms are held together by covalent bonds
an electrical attraction between two oppositely charged atoms or groups of atoms
process by which atoms or groups of atoms in substances are reorganized into different substances
substance that lowers the activation energy needed to start a chemical reaction
biological catalyst that speed up the rate of chemical reactions in biological processes
specific location where a substrate binds on an enzyme
molecules that have an unequal distribution of charges
the electrostatic attraction
the substance that is dissolved in the solvent
substance in whih another substance is dissolved
anothe name for homogeneous mixture
the smallest component of an element
Dense, positively charged mass at the center of an atom.
Positively charged subatomic particle found in the nucleus.
Neutral subatomic particle found in the nucleus.
Negatively charged subatomic particle found outside the nucleus.
The sum of the protons and neutrons in the nucleus of an atom.
This number identifies the element and is equal to the number of protons found in the nucleus.
An atom with a charge (unequal number of protons and electrons)
Versions of the same element with different numbers of neutrons.
The possible energies that an electron in an atom can have.
The weighted average mass of all of an element's isotopes' mass numbers (usually a decimal).
A visual model showing the most likely locations for the electrons in an atom.
The arrangement of electrons around the nucleus of an atom.
When all of the electrons in an atom have their lowest possible energies.
the property of a body that causes it to have weight
the property of something that is great in magnitude
a stable particle with positive charge
an elementary particle with negative charge
of or relating to constituents of the atom or forces within the atom
(nontechnical usage) a tiny piece of anything
What is the smallest particle of an element consisting the same chemical properties of the element
the particle in the nucleus of the atom which has the biggest mass and no charge which determines the atomic mass with the proton
the particle in the surrounding cloud of the nucleus having a negative charge and is 1000 times smaller than a proton
the charge of a proton
the charge of an electron
the positive subatomic particle in the nucleus which determines its atomic number and along with the neutron determines the atomic mass
a set of elements which are organized on a table according to the atomic number, electron configuration, and physical/chemical properties
anything that has mass and takes up space
the rows of the periodic table; they go in an ascending order with the atomic number
the columns of the periodic table; they are grouped by similar chemical and physical properties
the mostly nonreactive group which are at the rightmost of the periodic table
the most reactive metal group located at the leftmost of the the periodic table.
a group of elements consisting of properties of metals and nonmetals and are located on the diagonal line
any of the group of bivalent metals including barium, radium, strontium, calcium, and, usually, magnesium, the hydroxides of which are alkali's but less soluble than those of the alkali metals.
one of a class of substances that cannot be separated into simpler substances by chemical means.
an atom that is either mostly negatively charged or mostly positively charged
A usually irreversible change that changes the arrangement of the atoms in the chemical composition that involves a formation of a new substance.
A usually reversible change in the physical properties of a substance.
a property of a substance of matter that can be observed without changing the chemical composition of the substance.
a property or characteristic of a substance that is observed during a reaction in which the chemical composition or identity of the substance is changed
show the material's ability to be molded into a different shape
shows the material's ability to be drawn into a thin wire
shows the materials's ability to catch fire
shows the materials's ability to react with another substance