1.

There are elements with atomic numbers 4, 14, 8, 15 and 19. From this information answer the following questions. a) A solid non-metal of valency 3.b) A gas of valency 2.c) A metal of valency 1.d) A non metal of valency 4.

Answer»

a) The element with atomic number 15 is phosphorus. Its electronic configuration is 2, 8, 5. So its valency is 3 and it is a solid non-metal.

b) The element with atomic number 8 is oxygen. Its electronic configuration is 2, 6. So its valency is 2 and it is a gas.

c) The element with atomic number 19 is potassium. Its electronic configuration is 2, 8, 8, 1. So its valency is 1 and it is a metal.

d) The element with atomic number 14 is silicon. Its electronic configuration is 2, 8, 4. Its valency is 4 and it is a nonmetal.



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