electron configuration Flashcards
(6 cards)
1
Q
what is the mass number
A
the number of protons and neutrons in the atom
2
Q
what is the atomic number
A
the number of protons or electrons in the atom
3
Q
how many electrons are in the first shell
A
2
4
Q
how many electrons are in the second shell
A
8
5
Q
how many electrons are in the third shell
A
8
6
Q
how many electrons are in the fourth shell
A
18
