Question

the description of atomic particles of two elements x and y are given below: protons are 8 neutrons are 8 and 9 and electrons are 8 in both the cases. what is the atomic number of Y? what is the mass number of X? what is the relation between X and Y?

Answer 1

Atomic number of Y is 8.

Mass number of X = 8 + 8 = 16 ( protons + neutrons = mass number ).

Mass number of X and Y is 16 and 17 respectively, while the X and Y is 8. so these are isotopes of each other.

Answer 2

• what is the atomic number of Y? Atomic number of Y = no. of electrons/protons = 8

• what is the mass number of X? Mass number of X = no. of protons + no. of neutrons = 8 + 8 =16

• what is the relation between X and Y? X and Y are isotopes since they have the same atomic number.