There are three atomic species : 16/8a, 17/8b, 18/8c. are they isobars

1.	There are three atomic species : 16/8a, 17/8b, 18/8c. are they isobars? why are their mass numbers different ? what is their nuclear omposition
Answer» ANSWER: No, these are isotopes! yes! Explanation: Isotopes are those having same atomic number but different atomic MASSES. atomic number is written at the bottom while mass at the top of element. going with that, 16/8a 17/8b and 18/8c is having same atomic number but atomic mass is different, hence these are isotopes. mass number is different because of present of neutrons. neutrons may change but no. of protons will be constant. always remember, atomic number GIVES no. of protons which is also equal to no. of electrons. and atomic mass gives no. of protons plus neutrons. 16/8a has 8 protons, 8 electrons and 16-8 i.e. 8 neutrons. similarly, for 17/8b, it has same 8 protons and electrons but 17-8 ie. 9 neutrons. & for, 18/8c, it has 8 protons and electrons but 18-8 ie 10 neutrons.

There are three atomic species : 16/8a, 17/8b, 18/8c. are they isobars? why are their mass numbers different ? what is their nuclear omposition

Answer»

No, these are isotopes!

yes!

Explanation:

Isotopes are those having same atomic number but different atomic MASSES. atomic number is written at the bottom while mass at the top of element.

going with that,

16/8a 17/8b and 18/8c is having same atomic number but atomic mass is different, hence these are isotopes.

mass number is different because of present of neutrons. neutrons may change but no. of protons will be constant.

always remember, atomic number GIVES no. of protons which is also equal to no. of electrons.

and atomic mass gives no. of protons plus neutrons.

16/8a has 8 protons, 8 electrons and 16-8 i.e. 8 neutrons.

similarly,

for 17/8b, it has same 8 protons and electrons but 17-8 ie. 9 neutrons.

& for, 18/8c, it has 8 protons and electrons but 18-8 ie 10 neutrons.