How to find the Ka of an acid?
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The number 4 in the 4/2He indicates the atomic mass number of helium.
Answer: Option 3
<u>Explanation: </u>
The elements present in periodic table generally represented as . Here X will be the element in the periodic table, A is the atomic mass number of the element X and Z is the atomic number of the element X.
So, the number 4 is the atomic mass number of He and He-4 is the stable isotope of helium which can also be termed as alpha particle.
Mass number = number of protons + neutrons count.
Thus the number 4 denotes the Helium's atomic mass number.