Question

topic5 d4 assessment periodic table
17 of 42
most of the elements in groups 16 through 18 are classified as
alkaline earth metals.
nonmetals.
inner transition metals.
alkali metals.

Explanation:

• Alkaline earth metals are in group 2.
• Inner - transition metals are in the f - block (lanthanides and actinides).
• Alkali metals are in group 1.
• Groups 16 - 18 (except for polonium (Po) in group 16 which is a metalloid and oganesson (Og) in group 18 which is a synthetic element with unknown properties) mainly contain non - metals. For example, in group 16, oxygen (O), sulfur (S) are non - metals; in group 17 (halogens), all are non - metals; in group 18 (noble gases), all are non - metals.

Answer:

B. nonmetals.