CBSE Class 11-science Answered
why sodium has atomic mass equal to 23 rather than 22 ,also for chlorine 35 rather than 34, and how can we deduce formuula mass of NaCl.
Asked by Tariqulislam786 | 17 May, 2015, 11:57: AM
Expert Answer
Mass number = Total number of protons + Total number of neutrons
Sodium atom has 11 protons and 12 neutrons in its nucleus.
Hence Mass number = 11+ 12 = 23 amu
So the total number of protons and neutrons in a nucleus is numerically equal to the relative atomic mass of the atom.
Similarly chlorine has 17 protons and 18 neutrons
So mass number of chlorine atom = 17+ 18 = 35 amu
From the data we can calculate the mass number of NaCl
Mass of NaCl = 23 + 35 = 58 amu
Answered by Vaibhav Chavan | 17 May, 2015, 02:36: PM
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