Chemistry
Match the atomic number 19, 15, 8, 4, and 2 with each of the following :
(i) A metal of valency one.
(ii) A solid non-metal of period 3.
(iii) A rare gas.
(iv) A gaseous element with valency 2.
(v) An element of group 2.
Periodic Table
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Answer
(i) A metal of valency one — Atomic number 19 (Potassium).
(ii) A solid non-metal of period 3 — Atomic number 15 (Phosphorus).
(iii) A rare gas — Atomic number 2 (Helium).
(iv) A gaseous element with valency 2 — Atomic number 8 (Oxygen).
(v) An element of group 2 — Atomic number 4 (Beryllium).
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(c) The non-metals present in period 2 and metals in period 3.
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(iv) What is the valency of T ?
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