1/300,000 or <span>0.00000333333
</span>
Answer: 1, 2, 5 is the correct answer
Hello 2020 ;)
Explanation:
Closest I found was 'species that is harmed in a symbiotic relationship in which another species benefits - host'
The answer is <span>the atomic number and the mass number will decrease.
</span>
When atoms undergo radioactive decay, alpha particles release.
Alpha particles consist of two protons and two neutrons. So, mass is 4 (2+2) amu
<span>.
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:</span>

→

+

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