Question

Which of the following statements is correct? If none of the responses are correct, select (None).

(1) An O atom has the total charge of −8 since it has eight valence electrons
(2) A P3− anion has the total charge of −3 (or 3−) since it lost 3 electrons.
(3) The number of valence electrons for Mg is 3 for Mg belongs to the period 3.
(4) A Ca2+ cation has the total charge of +2 (or 2+) since it lost two electrons.
(5) (None)

Answer 1

An O atom has the total charge of −8 since it has eight valence electrons in correct

because O is having 2 valence and 6 valancy electrons

A P3− anion has the total charge of −3 (or 3−) since it lost 3 electrons. in correct

if any atom lose electrons it will get +ve charge

The number of valence electrons for Mg is 3 for Mg belongs to the period 3. in correct

its valence electrons are 2

A Ca2+ cation has the total charge of +2 (or 2+) since it lost two electrons. correct