What do the roman numerals in a cation's name indicate?
how many valence electrons in the atom
the cation's ability to become an anion
the positive charge on the cation
how many compounds the cation can form

Option (c) is the correct answer.

Explanation:

When an element gain electrons then it acquires a negative charge. For example,

Whereas when an element loses electrons then it acquires a positive charge.

For example,

The atom can also be written using roman numerals as Fe(II).

Therefore, we can conclude that roman numerals in a cation's name indicate the positive charge on the cation.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.

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