Which of two elements among the following will display the most similar chemical properties?a.aliminium and calcium\tnickel and phosphorus\tchlorine and sulphur\tcarcon and sulphur\tlithjium and potassium

Dear student 

Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level.
Li lithium and K potassium both belong to first group (alkali metals) and thus have similar chemical properties. 

Elements in the same group in the periodic table have similar chemical properties. This is because their atoms have the same number of electrons in the highest occupied energy level.
Li lithium and K potassium both belong to first group (alkali metals) and thus have similar chemical properties.