Question

Uranium (mass num 238 and atomic num 92) emits an alpha particle. The product has mass num and atomic num respectively as

1)238 and 90
2)238 and 91
3)236 and 92
4)234 and 90

any one... ​

Answer 1

The atomic number of uranium (see periodic table) is 92, and the mass number of the isotope is given as 238. Therefore, it has 92 protons, 92 electrons, and 238 — 92 : 146 neutrons. Its symbol is U92238U92238 (or 238U).

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Answer 2

Answer

4) 234 and 90

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