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Variation of Valency

Assertion [A]...

Question

Assertion [A]: Sodium metal is reactive, whereas sodium ions are not.

Reason [R]: Sodium metal has an electronic configuration of 2, 8, 1 and sodium ions have a configuration of 2, 8.

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Solution

Sodium metal has an electronic configuration of 2, 8, 1. It has an electron in its outermost shell, which it can lose easily. Hence, it is reactive. On the other hand, sodium ion has a configuration of 2, 8, representing a stable configuration. Hence it does not react further.

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Q. Give reasons for the following:
(i) Sodium is more reactive than aluminium.
(ii) Mercury is not the only metallic liquid at around 30 C.
(iii) Metals always combine by electrovalency.
(iv) Metal ions are always positively charged.
(v) Metal ions always get discharged at the cathode during electrolysis.
(vi) Metals generally do not form hydrides.
(vii) Metals are always monoatomic.
(viii) Sodium and potassium cannot be kept exposed to air.
(ix) Sodium and potassium should not be treated with acids.
(x) Hydrogen is not a metal but it has been assigned a place in the reactivity series of metals.

Q. Assertion: Sodium Metal is reactive where as Sodium Ions aren't reactive.

Reason: Sodium Metal has an electronic configuration of 2, 8, 1. Sodium Ions have a configuration of 2, 8.

A

has electronic configuration of

2, 8, 1

and metal B has electronic configuration of

2, 8, 2

. Which metal is more reactive and why?

The correct electronic configuration for sodium ion is:

What is the electron configuration of sodium ion?

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