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Moseley's Law

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What is the atomic mass of the first 30 elements of periodic table

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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.

Q. Write the symbols of the first ten elements in the periodic table with the atomic numbers.

Elements with higher atomic masses can be placed before elements with lower atomic masses in the modern periodic table.

Q. In Mendeleev's periodic table, some elements with higher atomic masses were placed before the elements with lower atomic masses.

Q. Question 30
In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.

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