Question

Which statement is true about the atomic mass?

Answer 1

The statement that is true about the atomic mass is $\boxed{{\text{A}}{\text{. It can be greater than the atomic number}}}$

Further explanation:

The smallest particle that is the building block of matter is known as an atom. Most of the space in an atom is empty and its mass is concentrated inside a small region called the nucleus.

Protons, electrons, and neutrons are the three subatomic particles that are present in the atom. Electrons revolve around the nucleus in definite orbits.

An atom is also written as $_{\text{Z}}^{\text{A}}{\text{X}}$, where A is the atomic mass or mass number, Z is the atomic number and X is the letter symbol of the element.

Atomic number is equal to the number of protons present in the nucleus of the atom. Atomic mass is the total number of nucleons (protons and neutrons) within the atomic nucleus. It is also known as the mass number.

Atomic mass is the sum of the number of protons and the number of neutrons present in the nucleus of an atom. But the atomic number is equal to the number of protons only. So atomic mass is greater than that of atomic number. For example, sodium is written as $_6^{12}{\text{C}}$. Its atomic number is 6 whereas its atomic mass is 12 which is greater than 6. Therefore statement A is correct, whereas the remaining are incorrect.

Learn more:

1. Component of John Dalton’s atomic theory: brainly.com/question/2357175

2. Basis of investigation for the scientists: brainly.com/question/158048

Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Atomic structure

Keywords: electron, proton, neutron, atom, atomic mass, mass number, atomic number, A, X, Z, letter symbol, nucleons, correct, incorrect, 6, 12, C, greater.

Answer 2

the correct answer is A.

Each atom has three sub particles, which are electron, proton and neutron. To get the atomic mass for each atom, one has to add the masses of the proton, neutron and electron in an atom. For each atom, the major contributors to its mass are proton and neutron, this is because the mass of the electron is very small indeed. Thus, the atomic mass of an element is usually in the range of its mass number, which is obtained by the summation of proton and neutron. Since it is the number of proton that indicate an atomic number and it is the mass number that indicate atomic mass, therefore, atomic mass can be greater than the atomic number.