Assertion: The atomic masses of many elements are in fractions and not whole numbers. Reason: The fractional atomic masses of elements are due to the existence of their isotopes having different masses.
(a) Both Assertion and reason are true and the Reason is correct explanation of Assertion.
(b) Both Assertion and Reason are true but reason is not a correct explanation of the assertion
(c) Assertion is true but the Reason is false.
(d). Both Assertion and Reason are false.
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both are correct for the question because most of them are fractional because they are exists as mixture of isotopes of the different masses
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In the given assertion and reasoning excerpt;
Assertion: The atomic masses of many elements are in fractions and not whole numbers.
Reason: The fractional atomic masses of elements are due to the existence of their isotopes having different masses.
Option A) Both Assertion and Reason are true and the Reason is the correct explanation of Assertion.
- Many elements atomic masses are expressed as fractions rather than whole values because each element has a variety of naturally occurring isotopes, and the atomic mass is an average of all of these isotope weights.
- For example, Naturally occurring chlorine is 75% Cl35 and 25% Cl37
Therefore,
the Average atomic mass of chlorine=35× 75/100 + 37x25/100
= 26.25+9.25 =35.5 u
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