Electron configuration

1s² 2s² 2p³

• Group 3, Period 1

• Group 5. Period 2

• Group 2. Period 1

• Group 5. Period 5

1s² 2s² 2p⁶ 3s²

• Period: 3, Group: 1

• Period: 3, Group: 2

• Period: 2, Group: 2

• Period: 3, Group: 3

1s² 2s² 2p⁶ 3s² 3p⁵

• Period: 1 , Group: 1

• Period: 2 , Group: 7

• Period: 3 , Group: 7

• Period: 6 , Group: 7

1s¹

• H

• He

• Mg

• Cl

This element:

1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹

^{Has __________ electrons}

• 1

• 19

• 20

• 21

How confident do you feel with this topic?

• I understand it

• I have some doubts

• It is so difficult

• I did not have any idea of it

What do not you understand about it?