Phosphorus, Sulfur, Chlorine?

Question

What are the chemical and physical similarities between the 3?

...then how do they relate to their electron configurations
and positions in the periodic chart?
(I know they are adjacent to each other in increasing atomic number and mass)

Answer 1

S - 16 (atomic no.)
E.C. - 1s2 ,2s2, 2p6, 3s2, 3p4
Cl - 17 (atomic no.)
E.C. - 1s2, 2s2, 2p6, 3s2, 3p5
K - 18 (atomic no.)
E.C. - 1s2, 2s2, 2p6, 3s2, 3p7
S and Cl belongs to P-block element and K belongs to s- block element.
We would expect the size of an atom to depend mainly on the principal quantum number of the highest occupied orbital; in other words, on the "number of occupied electron shells". Since each row in the periodic table corresponds to an increment in n, atomic radius increases as we move down a column. The other important factor is the nuclear charge; the higher the atomic number, the more strongly will the electrons be drawn toward the nucleus, and the smaller the atom. This effect is responsible for the contraction we observe as we move across the periodic table from left to right.

Ionisation energy of sulphur is less then that of Cl.
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Answer 2

Argon is a noble gas. It exists as a monoatomic gas, Ar, Sulfur would not exists as S atom. The smallest unit of organic sulfur in nature is composed of 8 atoms. for this reason, the molecular formula of sulfur is S8 (8 could desire to be a subscript). Phosphorus exists as tetrahedral molecule. for this reason, each and each phosphorus molecule has 4 atoms. Its formula is P4 (4 could desire to be a subscript) Nitrogen exists as a diatomic molecule. Its formula is N2 (2 is a subscript)

Answer 3

they are all non metals, There all in in the same period