Teflon's non-stick property is due to: MCQ with Answer and Explanation

Explanation:
In a neutral atom, number of protons = number of electrons = 18. Mass number = protons (18) + neutrons (22) = 40. This is ⁴⁰Ar. Number of neutrons alone doesn't determine mass number.

Explanation:
Graham's law: r ∝ 1/√M (molar mass). At same T,P, rate inversely proportional to square root of density. Lighter gases diffuse faster. Used in uranium enrichment (UF₆).

Explanation:
Allotropes are different structural forms of the same element. Diamond has a tetrahedral sp³ network, while graphite has a planar sp² layered structure. This difference in atomic arrangement results in distinct physical properties: diamond is hard, transparent, insulating; graphite is soft, black, conducting. Allotropes have same chemical composition (pure carbon). Other allotropes include fullerenes and graphene.