CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 17

Periodic Classification of Elements 3 marks Medium

From the elements Li, K, Mg, C, Al, S identify the

(a)elements belonging to the same group.
(b)element which has the tendency to lose two electrons.
(c)element which prefers sharing of electrons to complete its octet.
(d)most metallic element.
(e)element that forms acidic oxide.
(f)element that belongs to group 13.

Answer

Same group: Li and K; loses two electrons: Mg; shares electrons: C; most metallic: K; acidic oxide: S; group 13: Al.

(a) Li and K (both in group 1, with one valence electron each) (b) Mg (2, 8, 2), which forms

Mg^{2 +}

(c) C (2, 4), which completes its octet by forming covalent bonds (d) K, which is in group 1 and lies lowest of the six (period 4) (e) S, whose oxides

SO_{2}

and

SO_{3}

are acidic (f) Al (2, 8, 3)

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CBSE Class 10 Science 2020 · Paper 31/5/1 · Question 17

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