Select the element(s) that will have ONE unpaired electron in the p orbital. Ca

N

B

Ar

Br

The element B will have ONE unpaired electron in the p orbital.

Explanation:

The electronic configuration of each given element is as follows.

Atomic number of calcium (Ca) is 20.

Ca:

Atomic number of nitrogen (N) is 7.

N:

Atomic number of boron (B) is 5.

B:

Atomic number of argon (Ar) is 18.

Ar:

Atomic number of bromine (Br) is 35.

Br:

Therefore, boron is the only element that have one unpaired electron in the p-orbital.

Thus, we can conclude that element B will have ONE unpaired electron in the p orbital.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e