Question

Use the periodic table to answer the question.

The periodic table of elements shows element groups, periods, and element properties.

Which element in the list is the most reactive?

(1 point)
Responses

S
S

C
C

Cs
Cs

Ba

Answer 1

Cs

Reason: Cesium is an alkali metal (one valence electron) with very low ionization energy and large atomic size, so it is extremely reactive (especially with water). Barium (an alkaline earth) and nonmetals C and S are less reactive.