Answer
Sn - Tin (Latin - stannum)
Pt - Platinum
Hg - Mercury ( Latinized Greek name - hydrargyrum)
Mg - Magnesium
K - Potassium ( Neo - Latin - kalium)
Ag - Silver ( Latin - argentum)
Work Step by Step
Some symbols are derived from Latin names of elements, e.g. Sn - Tin (Latin - stannum).