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ICSE Class 7 Chemistry Question 3 of 16

Atomic Structure — Question 6

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Question

Question 6

Explain the term – 'atomicity'. Give a reason why –

(a) Helium is considered monoatomic, but hydrogen a diatomic molecule.

(b) Ozone is considered triatomic, but phosphorus a tetratomic molecule.

Answer

Atomicity — It is the number of atoms present in a molecule of an element.

(a) Helium (He) is considered monoatomic because it contains only one atom of helium while hydrogen contains two atom of hydrogen (H2) therefore it is considered a diatomic molecule.

(b) Ozone is considered triatomic because it is composed of three atoms of Oxygen (O3) while phosphorous is composed of four atoms (P4), therefore, it is considered a tetratomic molecule.