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 | 9th 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
= 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)
Atomic mass = mass of protons + mass of neutrons
Answered by | 9th Apr, 2014, 04:50: PM
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