Across: |
| 1. | J.........................discovered another subatomic particle which had no charge and a mass nearly equal to that of a proton | | 3. | ,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,are defined as the atoms of the same element, having the same atomic number but different mass numbers | | 5. | .............. are present in the nucleus of all atoms |
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Down: |
| 2. | the ................. is defined as the total number of protons present in the nucleus of an atom | | 4. | An isotope of ............... is used in the treatment of goitre |
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