10. From the symbol ^42He for the element helium, write down the mass number and the atomic numb

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When a light ray falls on a surface and it bounces back, this phenomenon is termed as a reflecti

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In this question we are given the mass of a man which is equal to 100 kG and is sitting on a cha

10. From the symbol $^4_2He$ for the element helium, write down the mass number and the atomic number of the element