Writing Electron Configurations

There are two electrons in energy level 1, sublevel s.

There is 1 electron in energy level 2, sublevel s.

There are two electrons in energy level s, sublevel 1.

There is 1 electron in energy level 1, sublevel s.

Energy level 1, sublevel s.

Energy level 1, sublevel p.

Energy level 18, sublevel s.

Energy level 2, sublevel s.

You count using your periodic table.

All s end in 2, all p end in 6, all d end in 10, and all f end in 14.

You have to make an educated guess.

1s²2s²2p⁶3p⁵

3s²3p⁵

1s²2s²2p⁶3s²3p⁵

atomic mass

atomic number

mass number

4

3

2

4s²

3d⁵

3p⁶

Period number minus 1.

Same as Period number.

Group number minus 1.

Period number minus 2.

3d

4d

4p

4f

5

10

3