match the atomic number 2,4,8,15,19 with each of the following
(i) A soild non-metal belonging to the third period.
(ii) A metal of valency 1.
(iii) A gaseous element with valency 2.
(iv) An element belonging to group 2.
(v) A rare gas
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Answer:
(i) is oxygen.
(ii) is Potassium.
(iii) is also oxygen
(iv) is Boron
(v) is Helium
Explanation:
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