CBSE Class 9 Answered
what is atomic mass of mercury? if atomic number of element is same then why there is difference in atomic mass?
Asked by Kusum and Sanjeet | 18 Dec, 2013, 09:31: PM
Expert Answer
Atomic mass of Mercury is 200.
Elements that have same number of protons but different number of neutrons are called isotopes.
To differentiate isotopes, a value called the mass number is used.
The mass number of an element is the number of protons and neutrons in an atom.
Magnesium is an element with three isotopes; all magnesium atoms have 12 protons, but 79% have 12 neutrons , 10% have 13 neutrons and 11% have 14 neutrons.
Answered by Vaibhav Chavan | 20 Dec, 2013, 11:36: AM
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