Q. 85.0( 3 Votes )

Atoms of eight el

Answer :

i. and B belong to group 1 and 2 because they form basic oxides. C belongs to group 13 as it has 3 valence electrons. D belongs to group 14 as it forms almost neutral oxide. E and F belong to group 15 and 16 as they form acidic oxides, G belongs to group 17 as it has 7 valence electrons and H belongs to group 18. They belong to 3rd period of the Periodic Table because AG is NaCI, added in a small amount to almost all vegetable dishes during cooking and Na and Cl belong to 3rd period.

ii. onic compounds will be formed because ‘B’ is metal and ‘F’ is non-metal. ‘B’ can lose two electrons and ‘F’ can gain two electrons.

Ionic compounds are compounds made up of ions. These ions are atoms that gain or lose electrons, giving them a net positive or negative charge. Metals tend to lose electrons, so they become cations and have a net positive charge. Nonmetals tend to gain electrons, forming anions that have a net negative charge.

iii. A and B are definitely metals as they form basic oxides.

Metal oxides are basic in nature because they react with dilute acids to form salt and water. They also dissolve in water to form metal hydroxides which are alkaline in nature. These metal hydroxides release OH- ions, so they are basic.

iv. Elements G and H are gaseous at room temperature

v. CG3 is the formula of the compound formed by combination of C and G.

C has the valence electrons of 3 therefore its valency will be 3

G has valence electrons as 7 therefore its valency will be 1


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