No.
Electromagnetic waves can travel without a medium.
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Potassium is an alkali metal with the chemical symbol K. It has an atomic number of 19, meaning that it has 19 positively charged protons. It also contains 19 electrons, which have a negative charge, and 20 neutrons, which do not hold a charge
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- No of protons=No of electrons=15
<h3>Mass no:-No of neutrons+No of protons </h3>

Now
- It has atomic no 15 hence its Phosphorus(P)
Electronic configuration:-
.
Chloride formula:-

or.
