A) isobar
B) isotope
C) isotone
D) none of these
Correct Answer: A
Solution :
Nucleon = number of (p + n) = mass number Atomic number = number of proton Atom of different elements having same mass number (i.e., same number of p + n) but different number of p (at number) are called isobars, e.g., \[_{6}{{C}^{14}}{{,}_{7}}{{N}^{14}}.\] Atoms of same element having same number of p (same atomic number but different mass number i. e., different number of neutrons) are called isotopes e.g., \[_{1}{{H}^{1}}{{,}_{1}}{{H}^{2}}{{,}_{1}}{{H}^{3}}\] are isotopes of hydrogen. Atoms of different element having same number of neutrons are called isotones. e.g., \[_{6}{{C}^{13}},{{\,}_{7}}{{N}^{14}}\] = Number of neutrons =14-7=7 number of neutrons = 13 - 6 = 7
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