prove the elements with similar configuration of valence electron are repeated after regular interval .how does it lead to periodic law??

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Solution

According to modern periodic law the elements are arranged according to increasing atomic number. While arranging the elements Moseley found that elements with same valence electrons are grouped together. For ex., alkali metals. All have ns¹ electrons and they are grouped as s block elements. Lithium, sodium, potassium etc.,

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Q. State, whether the following statements are true or false:
(i) Fluorine has higher electron affinity than chlorine.
(ii) Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
(iii) Al₂O₃ is an amphoteric oxide.
(iv) On moving horizontally across a period, number of valency electrons increases from one to eight.
(v) All members of zero group are non-metals.
(vi) The elements with higher electron affinity have higher ionization potential.

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Q. The periodic repetition of the elements with similar properties after certain regular interval when atoms are arranged in increasing order of atomic number is called periodicity.

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The periodical repetition of elements with similar properties after certain regular intervals when elements are arranged in order of increasing atomic number is called:

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