There are 3 isotopes of carbon. Carbon-12, Carbon-13 and Carbon-14. The most abundant carbon isotope is carbon – 12. 

Correct option is C) Labour

Mass of l atom of carbon = 12.011 u  ∴ Mass of 20 atoms of same carbon isotope = 20 × 12.011 u  = 240.220 u ∴ The mass of 20 atoms of same...

Symbol Atomic Number (Z) Atomic mass Number (A) Neutron Number, N = A-Z % Abundance Stability \(_6^{12}C\) or C-12 6 12 6 98.9% Stable \(_6^{13}C\) or C-13 6 13 7 1.1% Stable \(_6^{14}C\) or C-14 6 14 8 <0.00017% Radioactive

B) aluminium

A) Xenon, Cesium

Correct option is C) 36

Correct option is A) 6, 7, 8

C) Isotope of Cobalt

Correct Answer - B-10 = 20%, B-11 =80%

Correct Answer - Refer to Section.