Identify the element below and give the symbols of the other elements in its group. [ar]4s23d104p4 element symbol:

[Ar]4s²3d¹⁰4p⁴

We see that the last level is this element is 4, so this element should be in
4th period, it has 4 p-electrons, so it should be in 16th group.
4th period, 16th group - it is Se.

You can also go to the next element after Ar, and count beginning of this element 16. (2+10+4 =16 electrons)
 From "K" (where K is the first) you count to 16 and it is going to be Se.

Because electrons have negligible mass, to account for the mass of the isotope, there must be 16 neutrons, 16 neutrally charged, massive, fundamental particles present in the sulfur nucleus. and thus finally, if we have the 32s2− ion, there are 18 electrons, 16 protons, and 16 neutrons.

C. chemical changeshope i : )