The atomic number and the mass number for each of the given elements are to be determined. Concept Introduction:  An atom consists of the nucleus and extra nuclear space.  Atoms of an element can exist in more than one form. Each form is termed as an isotope and differs from other forms by the number of neutrons, while the number of protons and electrons are equal and same in all the forms.  The atomic number (Z) of an atom or an ion is given by the number of protons while mass number (A) is the sum of the number of protons and neutrons. Atomic number is written as the subscript and mass number is written as the superscript.

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Chapter 3, Problem 20E

Interpretation Introduction

Interpretation:

The atomic number and the mass number for each of the given elements are to be determined.

Concept Introduction:

 An atom consists of the nucleus and extra nuclear space.

 Atoms of an element can exist in more than one form. Each form is termed as an isotope and differs from other forms by the number of neutrons, while the number of protons and electrons are equal and same in all the forms.

 The atomic number (Z) of an atom or an ion is given by the number of protons while mass number (A) is the sum of the number of protons and neutrons. Atomic number is written as the subscript and mass number is written as the superscript.

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