5.3 The Periodic Table Flashcards
1
Q
Atomic number
A
The number of protons in an atom of an element
Equation
# of p= z atomic number
2
Q
Atomic mass
A
Average mass off all the isostopes of a certain type
3
Q
Isotopes
A
Forms of the same atom that only differ in the number of neutrons
4
Q
Mass number
A
Total number of protons and neutrons together in an atomic nucleus, expressed in Amu
Equation
# of p +# of n= A mass number
5
Q
Atomic radius
A
The measure of the size of an elements atoms distance from the centet of the nucleus to the boundary of energy levels
6
Q
Ion
A
An atom or a group of atoms that has lost or gained electrons
7
Q
Period
A
Horizontal rows of the periodic table
There are 7 total
8
Q
Group
A
Also called a chemical family
The vertical columns in the periodic table there are 18 total
