Which of the following elements is a transition metal? a. mg b. fe c. pb d. at

b) Fe (iron)

Explanation:

Hi, Fe is the only of the listed elements that belongs to the transition metals.

The transition metals are huge group, with different characteristics between the elements in the group. They conform the groups 3 to 12 of the periodic table.

Althought Lead (Pb) is a metal, it belongs to the post-transition metals

Mg belongs to the alkline earth metals and At to the metalloids.

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