Question

i) Name

      a) three elements that have a single electron in their outermost shells. 

      b) two elements that have two electrons in their outermost shells. 

      c) three elements with filled outermost shells.

    ii) explain metallic and non-metallic properties​

Answer 1

Answer:

a) Hydrogen, Sodium, Lithium

b) Magnesium, Calcium

c) Helium, Argon, Neon

ii) Metals are lustrous, sonorous, malleable, ductile, good conductors of heat&electricity, dense, mostly solid state, hard in nature

Non-metals are not lustrous, not sonorous, not malleable or ductile and are not good conductors. They are mostly of gaseous or solid state. They are soft.

Exceptions:

Metals- Mercury is liquid at room temperature. Potassium and Sodium are soft and not very dense.

Non-Metals- Bromine is liquid at room temperature. Diamond is the hardest known substance. Graphite is a good conductor of electricity. Iodine has a lustre of its own.

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