) Give a suitable reason for the following statement. [4]a) Valency of

1.	) Give a suitable reason for the following statement. [4]a) Valency of phosphorus is -3. b) Magnesium is a metal. c)Neon is a noble gas. d) Gases are highly expansible.
Answer» Answer: (a) There are 5 valence electrons in a neutral phosphorus atom. To complete its octet, it gains THREE electrons from a donor atom, so its VALENCY is -3. (b) Magnesium has 2 valence electrons. So, it forms a POSITIVE ion by donating the 2 electrons to complete its octet. So, it is a metal. (c) Noble gases are ELEMENTS which have duplet or octet configuration. As Neon has EC of 1s2 2s2 2p6 and has an octet configuration, it is a noble gas and hence is almost non-reactive. (d) Gases are highly expansible because they have weak inter-molecular forces between their molecules and high inter-molecular distances. Explanation:

) Give a suitable reason for the following statement. [4]a) Valency of phosphorus is -3. b) Magnesium is a metal. c)Neon is a noble gas. d) Gases are highly expansible.

Answer»

Answer:

(a) There are 5 valence electrons in a neutral phosphorus atom. To complete its octet, it gains THREE electrons from a donor atom, so its VALENCY is -3.

(b) Magnesium has 2 valence electrons. So, it forms a POSITIVE ion by donating the 2 electrons to complete its octet. So, it is a metal.

(c) Noble gases are ELEMENTS which have duplet or octet configuration. As Neon has EC of 1s2 2s2 2p6 and has an octet configuration, it is a noble gas and hence is almost non-reactive.

(d) Gases are highly expansible because they have weak inter-molecular forces between their molecules and high inter-molecular distances.

Explanation:

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