22. when looking at the halogens on the periodic table, how does the number of valence electrons change as the
energy level is increased?
a. the total number of valence electrons does not change. it remains at 1.
b. the total number of valence electrons does not change. it remains at 1,
c. the total number of valence electrons increases by 1 with each energy level,
d. the total number of valence electrons decreases by 1 with each energy level,

The total number of valence electrons per atom does not change. It remains at 7 (as opposed to 1 in the options.)

Explanation:

The periodic table organizes elements with the same number of valence electrons in the same column.

All the halogens (F, Cl, Br, etc.) are found in the same column (the second column from the right) on the periodic table. The all have the same number of valence electrons per atom.

All elements in the right-most column (the one with all the noble gas elements) contain 8 valence electrons per atom (a full valence shell.) Since the halogens are to the left of the noble gas elements by only one place, each would contain valence electrons.

the gas collects in coils that then becomes a liquid that then flows through the coils inside the refrigerator

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.