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Heavy Water

30 Whether Is...

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30 Whether Isotopes and isobars concepts are given on the basis of atomic mass or on the basis of mass number ?? Kindly make it clear with differentiating the mass number and atomic mass.

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Q. Statement: Isotopes have same atomic number but different atomic mass number.

State whether the given statement is true or false.

Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes and (iv) Isobars. Give any two uses of isotopes.

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. Match List I with List II and select the correct answer by using the codes given below.
List I List II
A. Isotopes 1. atoms having same atomic number but different mass numbers
B. Isobars 2. atoms with same number of neutrons but different atomic numbers
C. Isotones 3. atoms with same mass number but different atomic numbers

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

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