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Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom1 Mark
MCQ
The relation between atomic number $(Z)$ and atomic mass $(A)$ for light elements is given by :
  • A
    $A = Z$
  • ✓
    $A = 2Z$
  • C
    $2A = Z$
  • D
    $A = 4Z$
✓

Answer

Correct option: B.
$A = 2Z$
Atomic number $(Z)$ is total no of proton present in nucleus and atomic mass $(A)$ is total no of proton and neutron present in nucleus.
For light atoms till atomic number $20,$ generally atomic mass is twice the atomic number.
$A = 2Z$ as $n = p$

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