Question

1. which of the following elements is a metalloid? a. boron b. oxygen c. calcium d. argon 8. elements in group 1 are known as: a. transition metals b. halogens c. alkali metals d. noble gases

Explanation:

• For question 7, boron is a metalloid as it has properties intermediate between metals and non - metals. Oxygen is a non - metal, calcium is a metal, and argon is a noble gas.
• For question 8, elements in Group 1 of the periodic table are alkali metals. Transition metals are in groups 3 - 12, halogens are in Group 17, and noble gases are in Group 18.

Answer:

1. A. Boron
2. C. Alkali metals