Question

Atomic numbers and mass numbers of five elements are given below in brackets.

A( 39,19), B(40, 18), C(14, 7), D(16, 8), E(2,4). Answer the following questions

based on this.

[1] Name the noble gas with duplet of configuration.

[2] A non metal with valency two.

[3] Element that forms a unipositive cation.

[4] Element which has FOUR shells.

[5] Noble gas with octet of configuration​

Answer 1

Answer:

(2) Oxide

Hope you understand

Answer 2

Answer:

1. helium

2. oxygen

3.The atoms that have 1 electron in their valence shell are the metals. They are highly reactive due to 1 or 2 electrons in their valence shell. Metal with atomic number 19 is potassium (K). It loses one electron to achieve the nearest noble gas stable configuration and forms a cation as K+.

4.Beryllium,Boron,Carbon,Nitrogen.

5.He called his explanation the octet rule. The octet rule states that atoms tend to form compounds in ways that give them eight valence electrons and thus the electron configuration of a noble gas. An exception to an octet of electrons is in the case of the first noble gas, helium, which only has two valence electrons.

Explanation:

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