CBSE Class 11-science Answered
Atoms may be regarded as comprising of protons,neutrons and electrons. If the mass attributed by electrons was doubled and that attributed by neutrons was halved, the atomic mass of C (mass number=12 atomic number=6)would be
(a)approximately the same
(b)doubled
(c)reduced approximately by 25%
(d)approximately halved
Asked by Yash Sahu | 09 Apr, 2014, 03:22: PM
Expert Answer
(c) reduced approximately by 25% is the correct option.
The mass of electron is negligible.
Atomic mass = mass of protons + mass of neutrons
Atomic mass = mass of protons + mass of neutrons
= 6 + 6
=12
If the mass of neutons is halved, then atomic mass = 6+3=9
Now 9 is approximately 25% of 12. Hence, the correct option is (c)
Answered by | 09 Apr, 2014, 04:50: PM
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