Question

Why did the Soviets face greater resistance from the mujahedeen than they expected? Check all that apply.

Answer 1

Hola mate.

.

.Isoelectronic are the species having same number of electrons.

A positive charge means the shortage of an electron.

A negative charge means gain of electron.

Number of electrons in Na+ = 11-1 = 10

Number of electrons in K+ = 19-1 = 18

Number of electrons in Mg2+ = 12-2 = 10

Number of electrons in Ca2+ = 20-2 = 18

Number of electrons in S2- = 16+2 = 18

Number of electrons in Ar = 18

Hence, the following are isoelectronic species:

1) Na+ andMg2+ (10 electrons each)

2) K+, Ca2+, S2- and Ar (18 electrons eachmole of water is equal to 18 g of H2O which is 6.023*10^23 molecules of water and also in each molecule of water there are 10 electrons(8 electrons from oxygen atom and 1 electron from each of the two hydrogen atoms).