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(a) The following is a list of the elec...

(a) The following is a list of the electron distributions of atoms of unknown elements.

Choose an element from the list for each of the following descriptions.
(i) It is a noble gas. (ii) It is a soft metal with a low density. (iii) It has a giant covalent structure similar to diamond. (iv) It can form a negative ion of the type `X^(3-`)
(b) How does electronic configurations of atoms change in a period with increase in atomic number?

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