Question

Which of the following subatomic particles contributes toward the atomic mass of hydrogen?

a. element
b. proton
c. electron
d. neutron

Answer 1

The correct option is: b. proton

Step-by-step explanation:

Hydrogen is the first and the lightest chemical element of the periodic table, having mass number 1.008 and atomic number 1. It is an s-block element that belongs to the group 1 of the periodic table.

The most abundant isotope of hydrogen is protium (
`_(1)^(1)\textrm{H}`). In the elemental state, it has one electron, one proton and zero neutrons.

Since, the mass number of a chemical element = the number of (protons + neutrons) present in the nucleus

⇒ atomic mass of hydrogen = 1 + 0 = 1

Therefore, only the proton contribute to the atomic mass of the hydrogen.

Answer 2

Proton and neutron.

Step-by-step explanation:

The atoms consists of three sub atomic particles - proton electron, and neutron. The proton and neutron are present inside the nucleus and electrons revolve around the nucleus.

The number of proton is equal to the number of electron in the neutral stage of atom. The atomic mass of an element can be calculated by the sum of number of neutrons and the number of protons. Hence, the subatomic particle - proton and neutron contribute to the mass of hydrogen.

Thus, the correct answer is option (b) and (d).