To find the correct answer, you need to find a hypothesis that cannot be proven wrong. All but one can indeed be proven wrong. The correct answer is there is a teacup orbiting the Milky Way galaxy because there is no way anyone can tell if there is a teacup orbiting the Milky Way galaxy or not. We know that it can be proven wrong because there is no life on Mars, the human species started in Africa and that humans cannot live without a certain amino acid. The only thing that really can’t be proven wrong is the one about a teacup.

5 0

2 years ago

many radioactive atoms that have large masses undergo radioactive decay by releasing a particle that is identical to a helium-4

igomit [66]

The answer is the atomic number and the mass number will decrease.

When atoms undergo radioactive decay, alpha particles release.

Alpha particles consist of two protons and two neutrons. So, mass is 4 (2+2) amu $^{4} _2 \alpha$ .
When an atom of emits an alpha particle, its atomic number will be reduced by 2 and a mass number will be reduced by 4:

$^{A}_ZX$ → $^{A-4}_{Z-2}X$ + $^{4}_{2} \alpha$

6 0

3 years ago

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