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
Ba

Answer 1

Cs

Reason: Cs is an alkali metal (Group 1) and alkali metals are the most reactive metals; reactivity increases down the group as ionization energy decreases, so cesium is more reactive than Ba, C, or S.