How does electronic configuration of atoms change in a period with increase in atomic number? [2 marks]

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Solution

On moving across a period from left to right, the atomic number of the elements increases.Therefore, the number of electrons in the valence shell increases from 1 to 8, i.e, the first element in the given period will have one electron in its valence shell and the last element in the same period will have eight electrons. [1 mark]

Therefore, the number of electrons in the valence shell of a atoms increases while moving across a period. [1 mark]

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How does electronic configuration of atoms change in a period with increase in atomic number? [2 MARKS]

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