Question

Magnesium is an alkaline earth metal with an atomic number of 12. It’s in the third row in the periodic table. Which expression shows one way to find the number of valence electrons in one atom of magnesium?

Answer 1

Answer:

..No. of electrones12

2n^2 is the formula

In Kshell n=1,2n^2 = 2

In Mshelln= 2,2n^2 = 8

In Lshell n=3,2n^2 = 18

In Mg the No. of electrons in 12

they are in 2,8,2Pattern

Here the valence electrons is 2