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The electronic configuration of A is 1s^2 2s^2 2p^6 3s^2

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The electronic configuration of A is 1s22s22p63s2
a) To which period does it belong?
b) Write down the formula of the nitrate of A.
c) State whether a solution of nitrate is conductor of electricity or not.

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a) Third period
b) A(NO3)2
c) Conductor of electricity

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