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 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.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

c-14 is carbon-14, or radiocarbon.   it is a radioactive isotope of carbon with an atomic nucleus containing 6 protons and 8 neutrons.