what are the types of atomicity ? describe them
Answers
Answer:
Monatomic – composed of 1 atom e.g. He, Ne, Ar (all noble gases are monatomic) Diatomic – composed of 2 atoms e.g. H2 , N2 , O. Triatomic – composed of 3 atoms e.g. O. Polyatomic – composed of 3 or more atoms e.g. P4 , S.
Explanation:
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Answer:
On the basis of atomicity, molecules can be classified as:
•Monatomic – composed of 1 atom e.g. He, Ne, Ar (all noble gases are monatomic)
•Diatomic – composed of 2 atoms e.g. H2 , N2 , O2
•Triatomic – composed of 3 atoms e.g. O3
•Polyatomic – composed of 3 or more atoms e.g. P4 , S8
Explanation:
The number of atoms present in a molecule of an element is called atomicity.
(i)Monatomic is a combination of the words "mono" and "atomic", and means "single atom". It is usually applied to gases: a monatomic gas is one in which atoms are not bound to each other. Examples at standard conditions include the noble gases argon, krypton, and xenon, though all chemical elements will be monatomic in the gas phase at sufficiently high temperatures. The thermodynamic behavior of a monatomic gas is extremely simple when compared to polyatomic gases because it is free of any rotational or vibrational energy.
(ii)Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements. The prefix di- is of Greek origin, meaning "two". If a diatomic molecule consists of two atoms of the same element, such as hydrogen (H2) or oxygen (O2), then it is said to be homonuclear. Otherwise, if a diatomic molecule consists of two different atoms, such as carbon monoxide (CO) or nitric oxide (NO), the molecule is said to be heteronuclear. The bond in a homonuclear diatomic molecule is non-polar.
(iii)Triatomic molecules are molecules composed of three atoms, of either the same or different chemical elements. Examples include H2O, CO2 (pictured) , HCN and O3(ozone).
(iv)A polyatomic ion, also known as a molecular ion, is a covalently bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zero. Unlike a molecule, which has a net charge of zero, this chemical species is an ion. (The prefix poly- carries the meaning "many" in Greek, but even ions of two atoms are commonly described as polyatomic.)