Isotopes

isotopes

source :quara.com

Isotopes were first discovered by Soddy in radioactive elements while isotopes of nonradioactive elements were discovered by  Richard.

Isotopes means same position ( iso :same : topes : position )

“Atoms of same element having same atomic number but mass number is different, are called isotopes.”

Ex.      (i)        ₁₇Cl³⁵,  ₁₇Cl³⁷

(ii)       ₈O¹⁶,  ₈O¹⁷, ₈O¹⁸

(iii)     ₇N¹³, ₇N¹⁴, ₇N¹⁵

(iv)      ₁H¹, ₁H², ₁H³