Question

Which of the following is a nonmetal?

A.
potassium (K)
B.
aluminum (Al)
C.
calcium (Ca)
D.
chlorine (Cl)

Answer 1

Chlorine (Cl), option D, is the nonmetal among the choices listed. It belongs to the halogen group, which consists of nonmetals known for forming compounds with metals.

Step-by-step explanation:

To determine which of the following is a nonmetal, we should look at their placement in the periodic table and their properties:

• Potassium (K) is in group 1, known as the alkali metals.
• Aluminum (Al) is a post-transition metal.
• Calcium (Ca) is in group 2, known as the alkaline earth metals.
• Chlorine (Cl) is in group 17, known as the halogens, which are nonmetals.

Therefore, the answer is D. Chlorine (Cl), which is a nonmetal and part of the halogen group. Halogens are known for readily reacting with metals to form various compounds, including salts.

Answer 2

D. chlorine (Cl)

Chlorine is a nonmetal. Chlorine is a halogen in family VIIA, which is on the right side of the metalloids on the periodic table.