Multiple Choice Question Answer XVII — task. Science CBSE, Class 10.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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1. The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is

The ratio of their charge and size is nearly the same
Both are found together in nature
Both have similar electronic configuration
Both have nearly the same size

2. Which one of the following groups of atoms or ions is not isoelectronic?

\(K^+\), \(Ca^2{^+}\), \(Ne\)
\(Na^+\), \(Mg^2{^+}\), \(Al^3{^+}\)
\(F^-\), \(O^2{^-}\), \(N^3{^-}\)
\(He\), \(H^-\), \(Li^+\)

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