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Modern Periodic Table

Why was the b...

Question

Why was the basis of classification of elements changed from the atomic mass to the atomic number?

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Solution

Elements in the periodic table are arrange by atomic number (number of protons) because various isotopes of elements exist with different atomic masses.

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Similar questions

Q. Define the Modern Periodic law. Why was it necessary to change the basis of classification from the atomic mass to the atomic number?

How did atomic number prove a better basis for the classification of elements?

The atomic number has been chosen as the basis for classifying elements. Why?

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. Atomic number is considered to be a more appropriate parameter than atomic mass for the classification of elements in a periodic table. Why?
How does atomic size of elements vary on moving from:
(i) left to right in a period?
(ii) top to bottom in a group?
Give reasons for your answers.

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