A. THORIUM-229
B. THORIUM-228
C. THORIUM-230
D. THORIUM-231
2007-12-09 08:08:48 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Chemistry
An alpha particle is a hehium nucleus, which is composed of two protons and two neutrons, i.e. it has a mass number of 4. Thus alpha decay (loss of an alpha particle by the nucleus) results in a decrease by 4 in the mass number and two in the charge number. Thus the decay product must have mass number 230, but it must also have charge number 90, so it is Thorium - 230, choice (c).
2007-12-09 08:21:16 · answer #1 · answered by Anonymous · 1⤊ 0⤋
Uranium 234
2016-09-29 01:39:06 · answer #2 · answered by ? 4 · 0⤊ 0⤋
after undergoes alfa decay an atom of uranium-238 become an atom of
2015-08-05 08:54:05 · answer #3 · answered by Khalid 1 · 0⤊ 0⤋
C. 92U234 ===> 2He4 + 90Th230
The atomic numbers and atomic mass numbers on each side have to come out equal. So memorize effective atomic numbers and mass numbers of electrons, positrons, neutrons, and alpha particles.
2007-12-09 08:13:59 · answer #4 · answered by steve_geo1 7 · 0⤊ 0⤋
230
2014-03-30 05:47:30 · answer #5 · answered by Harry 1 · 0⤊ 0⤋
thorium
2016-05-22 08:41:25 · answer #6 · answered by ? 3 · 0⤊ 0⤋