Question

An element X with atomic number 29 has two isotope Y and Z. Isotope Y and Z have 34 and 38 neutrons respectively. Calculate:

(a) Mass of each isotope and write their nuclear symbols.

Answer 1

Atomic mass = number of protons + number of neutrons.

The element with atomic number 29 is copper (Cu).

Isotope Y:

Mass = 29 + 34 = 63;

Symbol: $^{63}_{29}Cu$

Isotope Z:

Mass = 29 + 38 = 67;

Symbol: $^{67}_{29}Cu$