Question

Identify the ion that has a charge of +2 and contains 27 electrons.
Choose one answer.
a. Ga2+
b. Cu2+
c. Mn2+
d. Co2+
e. Si2+

Answer 1

atomic number is 29....it's copper

Answer 2

for this question to be answered you need a periodic table of elements, you look at atomic numbers and when you find an element with 27 electrons and then add 2 electrons for element to be neutral. if its anion you seek than substract its charge example Cl- has 18 electrons but -1 equals to 17 and that is how much Cl really has electrons.