Question

Select the correct location on the image.

Which of these four elements is the most reactive metal?
A) Na
B) AI
C) Rb
D) In

Answer 1

Option C). Rubidium (Rb) is the most reactive metal among Na, Al, Rb, and In, due to its position in the periodic table as an alkali metal with the lowest first ionization energy in its group.

Step-by-step explanation:

Among the four elements listed: sodium (Na), aluminum (Al), rubidium (Rb), and indium (In), rubidium (Rb) is the most reactive metal. This is because reactivity in metals increases as we go down the group in the periodic table.

Rubidium (Rb) is an alkali metal, found in the first group of the periodic table, which is known for having the most reactive metals. These metals, including lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr), react vigorously with water. Rubidium is at the bottom left of the rectangle within the periodic table that contains these metals, which indicates that it has the lowest first ionization energy among them, contributing to its high reactivity.