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We are given $\mathrm{S}$ ordata-custom-editor="chemistry" $\mathrm{Ar}$ atoms. We have to find larger atom in pair.

As we know, as the nuclear charge increases, atomic size shrinks, drawing everything together and bringing the electrons closer to the nucleus.
As we progress from top to bottom, the atomic size grows as the electrons occupy larger and larger orbitals.

As a result, S and Ar exist.
Because S is at the left of the periodic table, it is the largest.

We are given S or O atoms. We have to find larger atom in pair.

As we know, as the nuclear charge increases, atomic size shrinks, drawing everything together and bringing the electrons closer to the nucleus.
As we progress from top to bottom, the atomic size grows as the electrons occupy larger and larger orbitals.

As a result, there is a relationship between sulphur and oxygen.
So, because sulphur has a higher period number, it is a larger atom.

We are given S or K atoms. We have to find larger atom in pair.

As we know, as the nuclear charge increases, atomic size shrinks, drawing everything together and bringing the electrons closer to the nucleus.
As we progress from top to bottom, the atomic size grows as the electrons occupy larger and larger orbitals.
As a result, S and K.
Because K has a bigger period number, it is a larger atom.

We are given S or Mg atoms. We have to find larger atom in pair.

As we know, as the nuclear charge increases, atomic size shrinks, drawing everything together and bringing the electrons closer to the nucleus.
As we progress from top to bottom, the atomic size grows as the electrons occupy larger and larger orbitals.
As a result, S and Mg.
Because Mg has a bigger period number, it is a larger atom.