   Chapter 2, Problem 18PS

Chapter
Section
Textbook Problem

Which of the following are isotopes of element X, the atomic number for which is 9: 9 19 X , 9 20 X , 18 9 X , and 9 21 X ?

Interpretation Introduction

Interpretation:

The isotopes of given element X are needed to be identified from the given four symbols of X, if the atomic number of X is nine.

Concept introduction:

• The atomic number of isotopes of an atom is equal.
• The complete symbol for an atom include mass number and atomic number in such a way that,

XatomicnumberZmassnumberAElementsymbol

Explanation

The atomic number of X is given as nine.

The given symbols of element X are X919,X920,X189andX921

The complete symbol for an atom include mass number and atomic number in such a way that,

XatomicnumberZ<

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