Question

the elements found in family 1 of the periodic table are so soft that they can be cut with a knife. what other property do they include?
a. they are brightly colored and are used to make pigments
b. they do not combine readily with other elements
c. they produce enormous heat when mixed with water
d. they are often found as single elements in nature

Explanation:

Family 1 elements (alkali metals) are highly reactive. Option A: Pigment use isn't a main property of alkali metals. Option B: They are very reactive, so they do combine readily. Option C: Alkali metals react vigorously with water, producing heat (exothermic). Option D: They are too reactive to be found as single elements in nature. So the correct property is producing heat with water.

Answer:

C. They produce enormous heat when mixed with water