Question

three metals from group 1 on the periodic table were tested for reactivity in water. a 1g sample of each metal was placed in water, and observations were recorded in a table.

metal	atomic number	observations
potassium	19	metal floats; vigorous fizzing; beaker becomes hot; flames appear
sodium	11	metal floats; moderate fizzing; beaker becomes very warm

which statement best describes a conclusion that can be drawn from the investigation about the reactivity of metals?
a. it is independent of the elements positions on the periodic table.
b. it is constant within the group on the periodic table.
c. it decreases down a group on the periodic table.
d. it increases down a group on the periodic table.

Explanation:

Lithium, sodium, and potassium are in Group 1. Reactivity increases from lithium (slight fizzing) to sodium (moderate fizzing) to potassium (vigorous fizzing and flames), showing reactivity increases down the group.

Answer:

D. It increases down a group on the Periodic Table.