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Variation of Valency

What is the v...

Question

What is the valency of magnesium with atomic number $12$ ?

A

2

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B

4

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C

5

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D

6

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Solution

The correct option is A $2$
The electronic configuration of magnesium is $2, 8, 2$ . The valence shell contains $2$ electrons. Therefore the valency is two.

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How to find out the answer of this question?

Q. Answer the following
A. Whati is the difference in the atomic models of Thomson and Rutherford ?
B. What is meant by valency of an element ? what is the relationship between the number of valence electron and valency ?
C. What is meant by atomic mass number ? Explain how the atomic number and mass number of carbon are 6 and 12 respectively.
D. what is meant by subatomic particle ? give brief information of three subatomic particles with refrence to electrical charge, mass and location.

Q. The number of valence electrons in magnesium atom are:

Q. Match the atomic number

2, 4, 8, 15,

19

with each of the following:
A gaseous element with valency

2

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

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