Question

What is always the different between two isotopes on an element? (Choose all correct answers)

		number of electrons
		number of protons
		number of neutrons

Answer 1

Ans :- Option (c) " Number of neutrons " is always the different between two isotopes on an element.

Explanation :-

Because, Isotopes have not only the same atomic number but also have same number of protons and electrons. The number of neutrons and mass number are not same in isotopes.

For example :- Three isotopes of Hydrogen have same atomic number, same number of protons and electrons but do not have same number of neutrons.

1). Protium (₁H¹) :- Atomic number = Number of protons =Number of electrons = 1 but Number of neutrons = 1-1 = 0

2). Deuterium (₁H²) :- Atomic number = Number of protons =Number of electrons = 1 but Number of neutrons = 2-1 = 1

3). Tritium (₁H³) :- Atomic number = Number of protons =Number of electrons = 1 but Number of neutrons = 3-1 = 2

Hence, Number of neutrons is the correct answer.