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Introduction

The mass of a...

Question

The mass of an atom is due to the mass of its nucleus and the nucleus of an atom contains protons and neutrons, together called as nucleons.

A

True

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B

False

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Solution

The correct option is A True
The nucleus consists of neutrons and protons, which are also known as nucleons. When the atomic mass is calculated, the mass of the electrons is considered negligible, due to its relatively insignificant mass.

So, the mass of the atom is mostly due to its nucleus which has protons and neutrons within it.

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Similar questions

Q. State true or false.
The mass of an atom is due to the mass of its nucleus and the nucleus of an atom contains protons and neutrons together called as nucleons.

Q. An atom of an element contains

13

electrons. Its nucleus has

14

neutrons. Find out its atomic number and approximate atomic mass. An isotope has atomic mass

2

units higher. What will be the number of protons, neutrons and electrons in the isotope?

Q. Nuclear binding energy is the energy released during the hypothetical formation of the nucleus by the condensation of individual nucleons. Thus, binding energy per nucleon =

\frac{Total binding energy}{Number of nucleons}

For example, the mass of hydrogen atom is equal to the sum of the masses of a proton and an electron. For other atoms, the atomic mass is less than the sum of the masses of protons, neutrons and electrons present. This difference in mass, termed as mass defect, is a measure of the binding energy of protons and neutrons in the nucleus. The mass-energy relationship postulated by Einstein is expressed as:

Δ E = Δ m c^{2}

Δ E

is the energy liberated,

Δ m

is the loss of mass, and c is the speed of light.

M P

M n

are masses of a proton and a neutron respectively. For a nucleus, its binding energy is

B

and it contains

Z

N

neutrons, the correct relation for this nucleus if

C

is velocity of light is:

Helium atom has an atomic mass of 4 u and two protons in its nucleus. How many neutrons does it have?

The total number of protons and neutrons in the nucleus of an atom is called ?

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