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Modern Periodic Law

where are iso...

Question

where are isotopes of the same elements having different atomic masses placed in the periodic table?

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Solution

According to Modern periodic table, the isotopes are not placed in different places , rather they are considered to have a single place because according to modern periodic law, atomic number is more accurate property than the atomic mass and so the elements have been arranged in order of increasing atomic number. Hence, the isotopes are placed in same position.

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Isotopes of chlorine (chlorine-35 and chlorine-37) have different atomic masses but are kept in different slots of the periodic table.

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. Consider the following isotopes of chlorine:

_{17} C l^{35},_{17} C l^{37}

,
Atomic masses of these isotopes are different, while their chemical properties are same. In the Mendeleev's periodic table isotopes of chlorine was placed:

Isotopes are the atoms of the same element; they have the same atomic number but different mass numbers. Isotopes have a different number of neutrons in their nucleus. If an element exists in two isotopes having atomic masses 'a' and 'b' in the ratio m: n, then average atomic mass will

\frac{m \times a + n \times b}{m + n}

Different isotopes of the same element have the same position in the periodic table. The elements which have single isotope are called monoisotopic elements. Greater is the percentage composition of an isotope, more will be its abundance in nature.

Answer the following questions:

The ratio of the mass of

^{12} C

atom to that of an atom of element= X (whose atomicity is four) is 1:9. The molecular mass element X is:

Q. Assertion :The placement of isotopes in Mendeleev's periodic table overcome in the modern periodic table. Reason: In modern periodic table, the elements have been allotted places based on their atomic numbers

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