atomic mass number 1 atomic number 2 symbol 3 atomic mass number 4 atomic number

Question

atomic mass number 1 atomic number 2 symbol 3 atomic mass number 4 atomic number 5 symbol 6 atomic mass number 1 atomic number 2 symbol 3 A neutron causes 232 Th 90 to change according to the following reaction. (a) Identify the unknown nucleus A X Z, givingits atomic mass number A, its atomic number Z,and the symbol X for the element. (b) The A X Z nucleussubsequently undergoes Beta-decay, and itsdaughter does too. Identify the final nucleus, giving its atomicmass number, atomic number, and symbol.

Explanation / Answer

Since a neutron is added to the element, it does not change, so itis still Thorium (atomic number 90). However its atomic mass haschanged to 233. Beta decay is when an electron is emitted from the nucleus when aneutron is converted to a proton plus an electron: 23390Th-->0-1e+23391Pa So it forms Protactinium So we do this again: 23391Pa-->0-1e+23392U So it forms Uranium (Atomic number 92, atomic mass 233)

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