<span>The superscripts in an electron configuration represents the number of electrons and protons in an element. </span>
Electron was discovered by J. J. Thomson in 1897 when he was studying the properties of cathode ray.
If the question includes x only than it’s value would be 1
Answer:
C
Explanation:
They are stabil and full of valence electron.
Given information : Sample of 
We need to find the moles of Chlorine in the given sample.
We can say that we need to find moles from the given atoms.
Relation between mole and atom is given by : 
Where
is Avogadro number.


On solving the above equation , atoms(unit) gets cancelled out and we get 0.0286 mol.
In the given sample the moles of Chlorine (Cl) is 0.0286 mol , so option A is correct.