Match the atomic number 19, 15, 8, 4, and 2 with each of the following:

(iv) A gaseous element with valency 2.

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Solution

Oxygen has atomic number 8 with electronic configuration 2, 6.

It has 6 valence electrons so has the tendency to accept 2 electrons.

Therefore, its valency is 2. Also, It is non-metal and a gaseous element.

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Q. Match the atomic number 19, 15, 8, 4, and 2 with each of the following:

(i) A metal of valency one.

Match the atomic number 2,4,8,15 and 19 with each of the following
(i) A solid non-metal belonging to the third period.
(ii) A metal of valency 1.
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(iv) An element belonging to group 2.
(v) A rare gas.

Column 1	Column 2
A solid non-metal belonging to the third period.	2
A metal of valency 1 .	4
A gaseous element with valency 2 .	8
An element belonging to group 2 .	15
A rare gas.	19

Match the atomic number 4, 8, 14, 15 and 19 with each of the following:

(a) A solid non-metal of valency 3.

(b) A gas of valency 2.

(d) A non-metal of valency 4.

Q. Match the atomic numbers 4, 14, 8, 15, and 19 with a gas of valency 2.

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Valency and Oxidation states

Standard X Chemistry

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Match the atomic number 19, 15, 8, 4, and 2 with each of the following: (iv) A gaseous element with valency 2.

Oxygen has atomic number 8 with electronic configuration 2, 6. It has 6 valence electrons so has the tendency to accept 2 electrons. Therefore, its valency is 2. Also, It is non-metal and a gaseous element.

Match the atomic number 19, 15, 8, 4, and 2 with each of the following:

(iv) A gaseous element with valency 2.

Oxygen has atomic number 8 with electronic configuration 2, 6.

It has 6 valence electrons so has the tendency to accept 2 electrons.

Therefore, its valency is 2. Also, It is non-metal and a gaseous element.