In , determine the number of

(i) neutrons

(ii) number of protons

Which of the two elements would be more reactive, element A of atomic number = 36 or element B of atomic number = 19?

An element has Z = 11, what is the valency of the element? Also, name the element.

An ion M^2– contains 10 electrons and 10 neutrons. What are the atomic number and mass number of the element M? Name the element.

A naturally occurring sample of lithium contains 7.42% of ⁶Li and 92.58% of ⁷Li. The relative atomic mass of ⁶Li is 6.015 and that of ⁷Li is 7.016. Calculate the atomic mass of a naturally occurring sample of lithium.