MCQ
Nature of electron beam travelling in same direction with same velocity is:
- Aconvergent
- Bdivergent
- ✓parallel
- Dcannot say
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$A\xrightarrow{\alpha }{{A}_{1}}\xrightarrow{\beta }{{A}_{2}}\xrightarrow{\alpha }{{A}_{3}}\xrightarrow{\gamma }{{A}_{4}}$
If the mass number and atomic number of $A$ are $180$ and $72$ respectively, then what are these number for $A_4$