The mass percentage of an element depends directly on the atomic number of that element.

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Q. A radioactive element

X

has an atomic number of 100. It decays directly into an element

Y

which decays directly into an element

Z

. In both processes a charged particle is emitted. Which of the following statement would be true?

Statement 1: Elements having same atomic number cannot have different mass numbers.
Statement 2: Atomic number depends on the number of neutrons.

Atomic mass of an element is equal to the total number of __________ present in an atom of that element.

Q. The average atomic mass of an element is calculated by its isotopic percentage but what if the average atomic mass is given and we have to find the percentage of a isotopes??
eg:- average atomic mass of an element exist 16.2 u. What is the percentage of isotopes
16. . 18
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8. 8

The mass numbers of three isotopes of an element are 10, 12, and 14 units. Their percentage abundance is 80, 15 and 5, respectively. What is the atomic weight of the element?

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