Chemistry
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.
Atomic Structure
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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.
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