Chapter 2, Problem 2.15E

Interpretation Introduction

(a)

Interpretation:

The number of protons, number of neutrons, and number of electrons in atom of ${}_2^3\text{He}$ are to be calculated.

Concept introduction:

The three subatomic particles are electrons, neutrons and protons. Out of these three, neutrons and protons are located inside the nucleus of an atom. In case of a neutral atom, the number of protons is equal to number of electrons. Also, the atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of number of atomic number and number of neutrons.

Interpretation Introduction

(b)

Interpretation:

The number of protons, number of neutrons, and number of electrons in atom of ${}_{\text{4}}^{\text{9}}\text{Be}$ are to be calculated.

Concept introduction:

The three subatomic particles are electrons, neutrons and protons. Out of these three, neutrons and protons are located inside the nucleus of an atom. In case of a neutral atom, the number of protons is equal to number of electrons. Also, the atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of number of atomic number and number of neutrons.

Interpretation Introduction

(c)

Interpretation:

The number of protons, number of neutrons, and number of electrons in atom of ${}_{\text{92}}^{\text{235}}\text{U}$ are to be calculated.

Concept introduction:

The three subatomic particles are electrons, neutrons and protons. Out of these three, neutrons and protons are located inside the nucleus of an atom. In case of a neutral atom, the number of protons is equal to number of electrons. Also, the atomic number of an atom is equal to the number of protons in an atom. Mass number of an atom can be calculated by taking the sum of number of atomic number and number of neutrons.