Correct order of melting point of group IIA elements is:
Correct answer: A. Be > Ca > Mg
- A. Be > Ca > Mg
- B. Ca>Be>Mg
- C. Mg > Be > Ca
- D. Be>Mg> Ca
Explanation
The correct order of melting points for group IIA elements is Be > Ca > Mg. This is because the melting and boiling points decrease from top to bottom in group IIA elements due to the increase in atomic sizes, leading to weaker binding forces between larger atoms compared to smaller atoms. Therefore, beryllium has the highest melting point, followed by calcium and then magnesium. The other options are incorrect because they do not follow this trend in melting points based on atomic size.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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