Question

the image below shows the first two columns of the periodic table.
which of the following sets of elements has the most similar physical and chemical properties?
a k, sr, li
b k, ca, rb
c k, cs, fr
d k, ca, sr

Explanation:

Elements in the same group (vertical column) of the periodic table have similar physical and chemical properties. K (Potassium), Cs (Cesium), and Fr (Francium) are all in Group 1 (alkali metals).

Answer:

C. K, Cs, Fr