Chapter 2.5, Problem 2.4BFP

(a)

Interpretation Introduction

Interpretation: The element needs to be determined for an atom with a mass number 88 and neutrons 50.

Concept Introduction:

For any element, the mass number is defined as the sum of the number of protons and neutrons in an atom; thus, the number of protons can be calculated.

  $\text{Mass number}=\text{Number of neutrons}+\text{Number of protons}$

Also, an atomic number is equal to the number of protons and electrons in an atom.

(b)

Interpretation Introduction

Interpretation: The number of neutrons in an isotope of the same element with mass number 86 needs to be determined.

Concept Introduction: For any element, the mass number is defined as the sum of the number of protons and neutrons in an atom thus, the number of protons can be calculated.

  $\text{Mass number}=\text{Number of neutrons}+\text{Number of protons}$

Also, an atomic number is equal to the number of protons and electrons in an atom.

For any isotope of an element, the atomic number or number of protons remains the same.