Unit 9B- Definitions- Periodic Table Flashcards
1
Q
Atomic number
A
The number of protons in an atom’ nucleus
2
Q
Groups
A
The vertical columns in the periodic table
3
Q
Periods
A
The horizontal rows in the periodic table
4
Q
Atomic mass
A
How much matter is in the nucleus
5
Q
Mass Number
A
The total number of protons and neutrons