8.5C 8. Element R and Element Q have the same number of valence electrons. These elements both have similar
chemical behavior, but Element Q has more energy levels than Element R.

i.e belongs to same group because of valence electrons are same

Explanation:

so it has same chemical behaviour. and q has more energy than r ionisation energy decreases from top to bottom

- aluminum and copper chloride.

- the chloride ion to separate the aluminum from the oxygen so that the aluminum can react with the copper ions (and the water molecules).

the role of the microscope world in creating new materials .