<span>Ca^(2+). Calcium is an alkaline earth metal with an atomic number of 20. Its electronic configuration is (2, 8, 8, 2). From the electronic configuration it would be observed that calcium has two valence electrons. Calcium shares these two electrons with non metals like sulphur in an ionic bond to obtain an outer shell which is full octet. Let me use Sulphur. When calcium gives out its two valence electrons its electronic configuration becomes (2, 8, 8) thereby obtaining a stable out shell and the calcium ion becomes Ca^(2+). The sulphur also obtains a stable octet because it has 6 valence electron initially.</span>
<span>It describes the true ratio of
atoms in a formula unit. An empirical formula is a formula that gives the
proportions of the elements present in a certain compound however it does not
give the actual numbers or the arrangement of the atoms.</span>
No it’s -3 not +3 There is an order on the periodic table Group 1 =+1 Group2=+2 Group 3=+3 Group 5=-3 (which is the group p is in) Group 6=-2 Group 7=-1
