Describe how the electronic structure of these elements changes across the period 3

Image result for Describe how the electronic structure of these elements changes across the period 3

In the whole of period 3, the outer electrons are in 3-level orbitals. ... In fact the increasing nuclear charge also drags the outer electrons closer to the nucleus. That increases ionisation energies still more as you go across the period.

Explanation:

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