horizontal row of elements on periodic table
period
vertical row of elements on periodic table
Group
an element that is a poor conductor of heat and electricity
Nonmetal
an element that is a good conductor of heat and electricity
Metal
the class we are all in
Chemistry
a pure substance made only of one kind of atom
Element
a specific portion of matter in a given region of space that has been selected for study during an experiment
System
a testable statement or educated guess
Hypothesis
broad generalization that explains a boy of facts or phenomena
Theory
something that has magnitude, size, or amount
Quantity
more than a physical object
Model
number of protons in the nucleus of each atom of that element
Atomic Number
general term for any isotope of any element
Nuclide
number of protons and neutrons in the nucleus of an isotope
Mass Number
1 amu is exactly 1/12 the mass of carbon-12 atom
Atomic Mass Unit
the weighted average of the atomic masses of the naturally occurring isotopes of an element
Average Atomic Mass
amount of a substance that contains sa many particles as there are atoms in exactly 12 gs of carbon-12
Mole
smallest particle of an element that retains the chemical properties of that element
Atom
a form of energy that exhibits wavelike behavior as it travels through space
EMR
all the forms of electromagnetic radiation
EMS
distance between corresponding points on adjacent waves
Wavelength
the number of waves that passes a given point in a specific time
Frequency
Refers to the emission of electrons from a metal when light shines on the metal
PhotoElectricEffect
the minimum quantity of energy that can be lost or gained by an atom
Quantum
lowest energy state of an atom
Ground State
higher potential energy than it is at the ground state
Excited State
the emission of a continuous range of frequencies of electromagnetic radiation
Continuous Spectrum
Physical and chemical properties of the elements are periodic functions of their atomic numbers
Periodic Law
14 elements from atomic number 58 to 71
Lanthinides
14 elements from atomic number 91 to 103
Actinides
metals with typically metallic properties
transitionmetals
positive ion
cation