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Ionization Enthalpy

Sodium and ch...

Question

Sodium and chlorine atoms combines:

A

to aquire electronic confriguration of argon

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B

to aquire highest oxidation state

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C

by exchanging valence electrons

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D

to complete their octets

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Solution

The correct option is D to complete their octets
An element which has high electronegative always has high electron gain enthalpy . its statement is wrong due to fluorine is most electronegative element but chlorine has more electron gain enthalpy . This is because of the small size of the fluorine so addition of electron is not favourable process because repulsion between the electron takes place .

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Q. Assertion :Octet rule is obeyed in the formation of sodium chloride. Reason: According to octet rule, the sodium atom which has only single electron in outermost shell , looses the electron to get a stable configuration like Ne gas, while the chlorine gas with 7 valence electrons gains an electron from the Na atom to obtain an stable configuration like Ar gas.

Q. Why does an atom of argon has zero valency ? Explain using the electronic configuration of argon.

Q. Assertion :Sodium and aluminium have atomic numbers

11

13

, respectively. They are separated by one element in the periodic table, and have valencies

1

3

respectively. Chlorine and potassium are also separated by element in the periodic table (their atomic number being

17

19

respectively) and yet both have valency

1

. Reason: Cl requires one electron to complete its octet and its valency is

1

K

has one electron in its outermost shell which it can easily loose to complete its octet and can attain the most balanced state after forming an octet. So both has valency

1

.

Q. (a) Which metal exists in liquid state at room temperature?
(b) Write electronic configuration of nitrogen and chlorine atoms.
(c) Show the formation of sodium chloride by the transfer of electrons between nitrogen and chlorine atoms.

Q. The electronic configuration of sodium atom is 2, 8, 1 and chlorine atom is 2, 8, 7. The atoms will form a bond by of electrons.

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