Which of the following elements matches the criteria below? 1. Has 4 energy levels 2. Tends to lose 3 electrons

a. K

b. Ga

c. Al

d. Ge

The correct option is: b. Gallium

Explanation:

The energy levels, also known as the electron shells, refers to the orbits containing electrons that are found around the nucleus of an atom. They are denoted by the symbols K, L, M, N, and so on.

a. Potassium is a s-block element that belongs to the group 1 and period 4 of the periodic table. It has four shells and the number of electrons per shell is 2, 8, 8, 1. Therefore, it tends to lose one valence electron present in the valence shell to gain the noble gas configuration.

b. Gallium is a p-block element that belongs to the group 13 and period 4 of the periodic table. It has four shells and the number of electrons per shell is 2, 8, 18, 3. Therefore, it tends to lose three valence electrons present in the valence shell to gain the noble gas configuration.

c. Aluminum is a p-block element that belongs to the group 13 and period 3 of the periodic table. It has three shells and the number of electrons per shell is 2, 8, 3. Therefore, it tends to lose three valence electrons present in the valence shell to gain the noble gas configuration.

d. Germanium is a p-block element that belongs to the group 14 and period 4 of the periodic table. It has four shells and the number of electrons per shell is 2, 8, 18, 4. Therefore, it tends to lose or gain four valence electrons present in the valence shell to gain the noble gas configuration.

Therefore, Gallium is the only element that has four energy levels and tends to lose three valence electrons.

The answer to your question is below.

Explanation:

1. Has 4 energy levels

a. K Potassium is in period 4 so it has four energy levels

b. Ga Also Galium is located in period four, so it has four energy levels.

c. Al Aluminum only has 3 energy levels.

d. Ge Germanium has four energy levels

2. Tends to lose 3 electrons

a. K Potassium only lose one electron

b. Ga Gallium loses 3 electrons because is in group three.

c. Al Aluminum loses 3 electrons

d. Ge Germanium tends to gain or lose four electrons.