Answer:
- Krypton.
- Silicon.
Explanation:
Hello.
In this case, since the first element's last term in the electron configuration is 4pā¶, by looking at the fourth period, the only element having sic 4p electrons is Kr as its electron configuration is:
[tex]Kr^{36}:1s^2,2s^2,2p^6,3s^2,3p^6,4s^2,3d^1^0,4p^6[/tex]
In the second case, the element of the third period having two 3p electrons or [tex]3p^2[/tex] the last term in its electron configuration is silicon as shown below:
[tex]Si^{14}:1s^2,2s^2,2p^6,3s^2,3p^2[/tex]
Best regards.
