Question

give correct answer with solutions.... ​

Answer 1

Answer:

Mass number is  11+12  =                        23

Atomic number=number of protons=   11

Valency=                                                    1+

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Answer 2

Answer:

No. of protons + no. of neutrons = mass no.

Therefore, mass no. = 23

No. of protons = no. of electrons = atomic no.

Therefore, atomic no. = 11

So, the element is Sodium(Na)

For valency,

The type of arrangement of electrons in the shells = 2, 8, 1

Therefore, valency = 1

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