One isotope of aluminum is 27/13al. how many electrons would a neutral atom of this isotope contain?

A neutral atom of _13^27Al contains 13 electrons.

The atomic number is 13, so the atom has 13 protons (+).

If the atom is neutral, it must contain 13 electrons (-).

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