Since average atomic mass
= 16 x X + 18 x (100 โ X )/100
16.2 = 16X + 1800 โ 18X/100
1620 = โ 2X + 1800
2X = 1800 โ 1620
X = 180/2 = 90
When 90% is the X-16 sample so for X-18 sample % = 100-90=10%
Question
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes ๐8 16 and ๐8 18 in the sample?
- structure of the atom CBSE Class 9
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๐ก Some Related Questions
For the following statements, write T for โTrueโ and F for โFalseโ. (a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons. (b) A neutron is formed by an electron and a proton combining together. Therefore, it is neutral. (c) The mass of an electron is about 1/2000 times that of proton. (d) An isotope of iodine is used for making tincture iodine, which is used as a medicine.
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