Question

One isotope of a metallic element has the mass number 64 and 34 neutrons in the nucleus. The cation derived from the isotope has 28 electrons.

Answer 1

given,

mass number = 64

number of neutrons = 34

cation derived has 28 electrons

we know that ,

mass number = number of neutrons + number of protons

64 = 34 + number of protons

number of protons = 30

hence number of electrons = 30

atomic number 30

the element is zinc(Zn).

cation derived has 28 electrons

it means 30 electrons - 28 electrons = 2 electrons are out from the element to form a cation of 28 electrons.

which means Zn⁺²