wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

Atoms contain protons, neutrons and electrons. The mass of a neutron is assumed to be half of its original value while that of an electron is assumed to be twice of the original value. Calculate the change in atomic mass of carbon (C12).

A
25 % more
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
75 % less
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
25 % less
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
50 % more
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 25 % less
Let mass of neutron = n
Given: new mass of neutron = n1 = n2
mass of electron (originally) = e
mass of electron (new) = 2e
For carbon
mass number of carbon (originally) = A = 12
Atomic mass of C-12 atom = mass of neutron + mass of proton
mass of protons = 6 unit
mass of neutron = 6×12= 3 unit
New mass number of C-12 atom = 9
% Decrease in atomic mass = A1AA×100 = 12912×100 = 25 %

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Discovery of Subatomic Particles
CHEMISTRY
Watch in App
Join BYJU'S Learning Program
CrossIcon