1.7 electronic structure

chemistry topic 1

What is the maximum number of electrons allowed in each of the first 3 shells?

1st shell: 2 2nd shell: 8 3rd shell: 8

When are atoms most stable?

When they have full electron shells.

The atomic number of Na is 11. What is the electron configuration of Na?

2, 8, 1

How is the electron configuration of an element related to its position in the periodic table?

The number of rings is the period. The number of electrons in the outer ring is the group. The total number of electrons is the atomic number. Sodium has 3 shells as there are 3 numbers. The last number is the number of outer shell electrons / the group. The sum of the digits is the atomic number.