Question

i)There are __________ Groups and ____________ Periods in the Modern Periodic Table .



ii)(Halogens) – Fluorine, Chlorine , and Bromine belong to Group ____________ .



iii)An example of divalent metal is ___________ .



iv)The black residue, obtained on heating copper carbonate ___________.



v)The formula of Potassium Sulphide -______________.



vi)A metal which react – explosively with cold water is - _____________.



vii)The Atomicity of Noble Gases - _____________ .



viii)The credit of the discovery of – Electrons , confers to _____________ .​

Answer 1

Here's your answer mate

1. 18 groups and 7 periods.
2. Group 17 [Group 7A (or VIIA)].
3. Magnesium .
4. Copper oxide (CuO) .
5. K2S.
6. Sodium and Potassium .
7. 1.
8. J.J Thompson.

Hope it helps you!!!!!!!!!!!

Answer 2

Answer:

hope it's help full for u