any similarity in the atoms of these elements?

Discussion in 'CBSE Class 10 Chemistry Help' started by phani, Jan 13, 2012.

  1. phani

    phani Member Staff Member

    Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?
    Yes. The atoms of all the three elements—lithium, sodium and potassium have one electron each in their outermost shells.

    Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?
    Both helium (He) and neon (Ne) have completely filled outermost shells. Helium has a duplet in its K shell, while neon has an octet in its L shell.

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