Question

write the formulae of oxides and hydrides of first 20 elements......
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Answer 1

Answer:

formula for an oxide is O2− . An oxide ion is a negatively charged oxidation state of oxygen.

The hydride ion is formula is H−

Explanation:

(c) calcium + nitrogen = calcium nitride (d) calcium oxide + carbon dioxide = calcium carbonate (e) magnesium + sulphuric acid = magnesium sulphate +hydrogen (f) sodium reacts with water to form sodium hydroxide and hydrogen .

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Answer 2

Helium Lithium and argon are noble gasses so they can't form any reactions

I have used 3 elements of my own choice(It won't be neat but the answers are correct)