Substance composed of atoms that cannot be broken down into smaller, simpler components
The time it takes for one-half the original radioactive parent atom to decay
The number of protons in the nucleus is called the atomic...
The negatively charged particle in an atom
Contain more than one element
The type of bond between atoms that involve the transfer of electrons
Particle found in the nucleus of an atom; No charge
The total number of protons and neutrons in the nucleus is called the atomic...
Anything that takes up Space and has mass
Positively charged particle in an atom
The center of an atom
Type of bond involving the sharing of electrons
Smallest particle that can contain the chemical properties of an element
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
The study of matter
Occupies space and has mass
Solid, liquid, gas
Pure substances consisting of only one kind of atom in each molecule.
Pure substances consisting of two or more atoms in each molecule
Chart of elements organized according to their atomic structure
The part of the atom containing the protons and neutrons
Positive particle of an atom. The number of these determines what kind of element it is
Neutrally charged particle found in the nucleus and has mass
Negatively charged particle outside the nucleus
Donated electrons form charged particles called ions to stick together
Shared electrons hold atoms together.
A distinct group of atoms bonded together
The smallest unit of an element
Shows how atoms in a molecule are located and connected
Show the number and type of atoms in a molecule
The ability to do work
A protein molecule or organic molecule used as a catalyst
Substances that affect the rate of a reaction but are not changed themselves. Also may start or stop a reaction from occurring.
The metric unit used to weigh of a bar of gold
Substances that enable enzymes to work properly.
Small amount of liquid chemicals would be measured using this metric unit.
Creator of the Periodic Table
When two or more compounds are joined together.
Diagram of Elements
Rows on the Periodic Table
Number of Protons in an Element
Chemistry that relates to non carbon compounds.
A substance with just one type of atom.
The place where Protons and Neutrons are housed
Group 18. These elements do not mix well with others.
How quick it is to join up with other elements.
A type of mixture that you cannot pick apart. A solution.
A type of mixture that you can pick apart.
A negatively charged particle.
Element with 2 protons.
positively charged particle.
A type of chemistry that involves carbon based life forms.
A particle that has no charge.
When two elements bond together.
Electrons are located around the nucleus in an electron what?
The point at which a solid turns to a liquid.
Point at which a liquid is turned into a gas.
Same number of protons different number of neutrons.
Al things that have mass and volume.
The lightest element known
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 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.
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
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
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 "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.
What are positively charged particles of the atom?
What are negatively charged particles of an atom?
What particle of anatom has no charge?
Where are protons found?
Where are electrons found?
An _______ is an atom that has the same number of protons but a different number of neutrons as other atoms of the same element.
The ____ ______ is the total number of protons and neutrons.
What detrmines the identity of an atom?
What is an average of the masses of all naturally occuring isotopes of an element?
The electrons in the outermost energy level of an atom are called _______ _________.
Alkali Metals only have ___ valence electron?
Valence electrons determine the _____ of which an element si placed.
Lithium is a?
Is Flourine a metal or nonmetal?
A ______ loses an electron and becomes positively charged.
A _____ gains an electron and becomes negatively charged.
A row of elements is called a ______.
What are charged particles that form during chemical changes?
What is it called when 2 atoms of nonmetals bond?
What is it called when a metal reacts with a nonmetal?