Question

Match the atomic number 4,8,14,15and 19 with each of the following: (a) A solid non-metal of valency 3. (b) A gas of valency 2. (c) A metal of valency 1. (d) A non-metal of valency 4. A solid non metal of valency 3

Answer 1

A) A solid non metal of valency 3 is phosphorus whose atomic no. is 15
b) A gas of valency 2 is oxygen whose atomic no. is 8.
C)A metal of valency 1 is Potassium whose atomic no. is 19
D) A solid non metal of valency 3 is is Phosphorus whose atomic no. is 15.



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Answer 2

Atomic number Element

5 B
8 O
14 Si
15 P
19 K



(a)
The solid non metal of valency 3 is PHOSPHORUS with atomic number 15.

(b)
The gas of valency 2 is OXYGEN with atomic number 8.

(c)
The metal with valency 1 is POTASSIUM with atomic number 19.

(d)
SILICON is the non metal with valency 4 and atomic number 14.

(e)
BORON is the solid metal with atomic number 4 and valency 3.




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