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Atomic Structure and Chemical Bonding — CHEMISTRY STD 9 — Question

ICSE BoardEnglish MediumSTD 9CHEMISTRYAtomic Structure and Chemical Bonding1 Mark
Question
From the symbol ${ }_2^4 \mathrm{He}$ for the element helium, write down the mass number and the atomic number of the element.
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Answer

Atomic number = 2
Mass number = 4

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