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) 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. |
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Answer» ONG>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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