Gold and silver are found in nature as free elements, while metals like sodium and calcium are never found in…

Question

Gold and silver are found in nature as free elements, while metals like sodium and calcium are never found in free form. What fundamental property of a metal determines whether it occurs in nature as a free element or in a combined state?

Accepted Answer

## Model Answer The fundamental property is **reactivity** (position in the activity series). Metals at the bottom of the activity series (like gold and silver) are **least reactive**, so they do not combine with other elements and are found in the free state. Metals at the top (like sodium and calcium) are **highly reactive** and readily combine with elements like oxygen, sulphur, etc., so they are never found in the free state in nature. *Source: Chapter 3, Section 3.4.1* ## Explanation - The examiner wants you to name the property (reactivity / position in activity series) and then link it to both examples given in the question. - Key phrase: "least reactive → free state"; "highly reactive → combined state." - Avoid vague answers like "chemical property" — be specific: **reactivity** or **position in the activity series**.

Science (086) — AI-generated practice question