Match the properties to the family of elements they describe.
react vigorously with metals
can be cut with a knife
are placed in group 17
are placed in group 12
don't react with any other
elements
alkali metals
halogens
are placed in group 1

Property                                                      Family                         Group

react vigorously with metals                     halogens                       17

can be cut with a knife                               alkaly metals                 1

don't react with any other elements         noble gases                 18              

Explanation:

Noble gases are placed in the group 18 of the periodic table. This family is formed by He, Ne, Ar, Kf, Xe, Rn, and Og. Since they have their valance shell complete, they tend to not react with other elements. Nevertheless, nowadays it is known that they can form some compounds.

Alkaly metals are placed in the the group 1 of the periodic table. This family is formed by Li, Na, K, Rb, Cs, and Fr.  They have 1 valence electron which makes them the most active metals. They are known because they are soft and can be cut by a knife, like they were butter.

Halogens are placed in the group 17 of the periodic table, This family is formed by F, Cl. Br, I, At, and Ts. They have seven valence electrons, which make them very active and ready to combine with metals either covalently or ionically.

pure substance: iron,copper

impure substance: water,charcoal