1. groups/ family of elements are ones which:

A. Have the same number of electrons in the valence/ outer engery level
B. Have exactly 8 electrons in the valence shell outer energy level
C. Have the same number of protons in the nucleus

2. A period represents elements which?
A. Have the same number of electrons in the valence shell
B. Have exactly 8 electrons in the balance shell
C. Have the same total number of electrons
D. For each successive element one more electron is added

and your thinking is...?

1 is A?

2 is B

nope on second. Look at D closely

1. The correct answer is A. Groups or families of elements are characterized by having the same number of electrons in their outer energy level or valence shell. This means that elements within the same group have similar chemical properties because they have the same number of valence electrons, which primarily determine an element's reactivity.

To determine the number of valence electrons for an element, you can refer to the periodic table. The group number of an element indicates the number of valence electrons it has. For example, elements in Group 1 (such as hydrogen and lithium) have 1 valence electron, elements in Group 2 (such as beryllium and magnesium) have 2 valence electrons, and so on.

2. The correct answer is D. A period in the periodic table represents elements where each successive element has one more electron added to its electronic configuration. This means that elements within the same period have the same number of electron shells or energy levels.

To determine the number of electron shells for an element within a period, you can look at its period number. For example, elements in Period 1 (such as hydrogen and helium) have 1 electron shell, elements in Period 2 (such as lithium and beryllium) have 2 electron shells, and so on.