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Moseley's Law

'In the Perio...

Question

'In the Periodic Table,elements are arranged in the increasing order of atomic mass.' True or False? Why?

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Solution

Dear student, The answer is True. Elements in the periodic table are arranged in the order of increasing atomic mass, because when Mendeleev arranged them in increasing order he noticed a periodic trend in the chemical properties of the elements. Regards,

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Why should elements in periodic table be arranged in increasing order of atomic no. And not atomic mass.

Q. True or False
In Mendeleev's periodic table, elements are arranged in an increasing order of their atomic number.

Identify the elements that weren't arranged in the increasing order of atomic mass in the Mendeleev's periodic table.

Q. According to Mendeleev's periodic law, the elements were arranged in the periodic table in the order of:

(a) decreasing atomic numbers
(b) increasing atomic numbers
(c) decreasing atomic masses
(d) increasing atomic masses

Q. Which of the following statement is correct in regard to the classification of elements?

(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

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