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Structure of Atom — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
MCQ
Identify the pairs which are not of isotopes?
  • A
    $^{13}_6\text{X},\ ^{13}_6\text{Y}.$
  • B
    $^{35}_{17}\text{X},\ ^{37}_{17}\text{Y}.$
  • C
    $^{14}_6\text{X},\ ^{14}_7\text{Y}.$
  • D
    $^{8}_4\text{X},\ ^{8}_5\text{Y}.$
✓

Answer

  1. $^{14}_6\text{X},\ ^{14}_7\text{Y}.$

  2. $^{8}_4\text{X},\ ^{8}_5\text{Y}.$

Explanation:

Isotopes have the same atomic number but different mass number.

$\therefore\ \Big(\ ^{14}_{6}\text{X},\ ^{14}_{7}\text{Y}\Big)$ and $\Big(\ ^8_4\text{X},\ ^8_5\text{Y}\Big)$ are not isotopes.

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