If the valence electrons were removed, what would be the ion charge of the element? mg = a. -1 b. +1 c. -2 d. +2

The correct answer is Option D.

Explanation:

Magnesium is the 12th element of the periodic table and the valence electronic configuration for this element is:

This element will loose 2 electrons to attain stable electronic configuration.

By loosing 2 electrons, this element will attain a charge of +2 units.

The electronic configuration after loosing 2 electrons and forming ion is

Hence, the correct answer is Option D.

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.