1. Following properties are common in the atoms of Helium and Neon: (i) Both have completely filled outermost orbit. (ii) Both have stable electronic configuration. (iii) Both belong to same group, i.e. zero group in Modern Periodic Table.

    Following properties are common in the atoms of Helium and Neon:
    (i) Both have completely filled outermost orbit.
    (ii) Both have stable electronic configuration.
    (iii) Both belong to same group, i.e. zero group in Modern Periodic Table.

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  2. Lithium, Sodium and Potassium have following similarities: (i) They all have valence electron equal to 1. (ii) They all belong to same group, i.e. Group 1st in Periodic Table. (iii) They all form ionic bond with non-metals. (iv) They all are highly electropositive. (v) They all are highly reactive.

    Lithium, Sodium and Potassium have following similarities:
    (i) They all have valence electron equal to 1.
    (ii) They all belong to same group, i.e. Group 1st in Periodic Table.
    (iii) They all form ionic bond with non-metals.
    (iv) They all are highly electropositive.
    (v) They all are highly reactive.

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