How do atomic structures (electron arrangements ) change in a period with increase in atomic numbers moving left to right ?

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Solution

The atomic number of elements increases by a factor of 1 as we move from left to right across a period. We know that elements in a period involve the filling of same valence shell. So in a period, the electronic configuration mainly involve changes in the valence shell. For example, consider carbon, nitrogen and oxygen. All these elements belong to the 2ndperiod. The atomic number of carbon is 6, of nitrogen is 7 while that of oxygen is 8. So, the electronic configuration of carbon is 2, 4; of nitrogen is 2, 5 while that of oxygen is 2, 6.

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Similar questions

(a) What is a period in a periodic table? How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
(b) How do the following change on going from left to right in a period of the periodic table?
(i) Chemical reactivity of elements
(ii) Nature of oxides of elements
Give examples in support of your answer.

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

Q. Assertion :Atomic size decreases as we move from left to right in a period. Reason: In a period from left to right the number of valence electrons in the same shell increases.

Q. The electron affinity increases on moving from left to right along a period. Arrange the reasons in a proper sequence.
(a) The amount of energy released during the addition of an electrons increases from left to right along a period.
(b) Effective nuclear charge of the elements increases from left to right.
(c) The atomic size of the elements decreases from left to right.
(d) The tendency to gain electrons and form anion increases from left to right.

Q. (a) Why did Mendeleev leave gaps in his periodic table?
(b) State any three limitations of Mendeleev's classification.
(c) How does electronic configurations of atoms change in a period with increase in atomic number?

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