Question

Electron Configuration...

Answer 1

Lets work through these in order.

Li+:
Li normally had 3 electrons. Li+ means that 1 electron has been taken away. This means the electronic configuration is 1s2.

Fe2+:
Fe normally has 26 electrons. Fe2+ means that it has 2 electrons taken away. This means the electronic configuration would be 1s2 2s2 2p6 3s2 3p6 4s2 3d3

Cl-:
Cl normally has 17 electrons. Cl- means that is has 1 more electron added on. This means the electronic configuration would be 1s2 2s2 2p6 3s2 3p5

N3-:
N normally has 7 electrons. N3- means that it has 3 more electrons added on. This means the electronic configuration would be 1s2 2s2 2p6

Mg2+:
Mg normally has 12 electrons. Mg2+ means that it has 2 electrons taken away. This means the electronic configuration would be 1s2 2s2 2p6

From this information we can conclude that N3- and Mg2+ have the electronic configuration of 1s2 2s2 2p6.

I hope this helped!

Answer 2

Wow thanks so much 😄

Answer 3

No problem :)