Missing entries has to be filled in the table that is given in the problem statement. Concept Introduction: An element can be expressed by the use of atomic symbol. Each and every element has its unique atomic number . Atomic number is the number of protons that is present in the nucleus of an atom. Mass number is the number of nucleons that is present in the nucleus. Protons and neutrons are known as nucleons. Atomic number is represented by symbol Z while mass number is denoted by A .

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Chapter 21, Problem 21.18QE

Interpretation Introduction

Interpretation:

Missing entries has to be filled in the table that is given in the problem statement.

Concept Introduction:

An element can be expressed by the use of atomic symbol. Each and every element has its unique atomic number. Atomic number is the number of protons that is present in the nucleus of an atom. Mass number is the number of nucleons that is present in the nucleus. Protons and neutrons are known as nucleons. Atomic number is represented by symbol Z while mass number is denoted by A.

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