General Science Chemistry Basic Concepts of Chemistry

নীচের কোন জোড়টি আইসোবার কে উপস্থাপন করছে? 

1
\(\rm {_2^3He} \ এবং \ {_2^4He}\)
2
\(\rm {_{12}^{24}Mg} \ এবং \ {_{12}^{25}Mg}\)
3
\(\rm {_{19}^{40}K} \ এবং \ {_{20}^{40}}Ca\)
4
\(\rm {_{19}^{40}K} \ এবং \ {_{19}^{39}K}\)
5

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