An atom of magnesium has 12 protons and 12 electrons. if the atom loses 2 electrons, what will be the charge on the ion that forms? –10 +10 +2 –2

The charge will be +2.

Explanation:

The atomic number of Mg is 12, so it has 12 protons.

The neutral atom of Mg has 12 electrons.

When an atom loses electrons it acquire positive charge.

The charge developed is equal to the number of electrons removed.

So the charge developed will be +2.

The equation will be:

A negative charge is developed when atom accepts 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

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