use the periodic table to answer the following questions. how many valence electrons does magnesium have? 12…

use the periodic table to answer the following questions. how many valence electrons does magnesium have? 12 x → 2 complete type in the correct values to correctly represent the valence electron configuration of magnesium: as^b a = b =

use the periodic table to answer the following questions. how many valence electrons does magnesium have? 12 x → 2 complete type in the correct values to correctly represent the valence electron configuration of magnesium: as^b a = b =

Answer

Explanation:

Step1: Locate magnesium in periodic table

Magnesium (Mg) has atomic number 12. It is in group 2 and period 3.

Step2: Determine valence - shell number

The period number gives the principal quantum number (n) of the valence shell. Since magnesium is in period 3, the valence - shell is the 3rd shell, so $A = 3$.

Step3: Determine number of valence electrons in outer - s orbital

Magnesium is in group 2, which means it has 2 valence electrons and they are in the s - orbital. So $B=2$.

Answer:

$A = 3$ $B = 2$