What are valence electrons? A. the atomic mass

B. the atomic number

C. all of the electrons in an atom

D. electrons in the outermost energy level

D

Explanation:

The simple answer is the electrons in the outermost energy level.

Hydrogen has 1 electron in the outermost energy level.

Magnesium has 2 so this tells you that magnesium has a charge of 2

Oxygen has 6  oxygen has a charge of - 2

Fluorine has 7

For most elements, the electrons in the most outer ring determine the valence of the element.

Notice that the non metals work differently than the metals. Mg may have a charge of 2 and that is the number of electrons in the valence right.

Oxygen is a non metal it has a charge of - 2. It gets 6 electrons by subtracting the number of its charge from 8.

D. electrons in the outermost energy level

Explanation:

The valence electrons are the electrons in the outermost energy level.

as the gila monster consumes the eggs or young of the desert cottontail and gambel's quail, thus its main food supply is only accessible for a restricted time duration every year. however, for this, the gila monsters exhibit three adaptations, which elevate their survival rate in the desert condition.  

first, is that they possess huge bodies, and can consume greater concentrations of food during a small period. secondly, they require to feed infrequently as they can accumulate fat in their tails. ultimately, their rate of metabolism is very low, so that they can burn their reservoirs of fat gradually.  

the tricuspid valve is present between right atrium and right ventricle