Elements that are in period ONE
Has ___ electron shells

1

Explanation:

Theres only one element in period one, and that is hydrogen. it has one proton, meaning it also has only one electron. This is one way to help you find the answer.

you can also find it by looking at the number beside it, that number is the amount of shells on the atom (Arrow pointing at it in the image below)

truck y has a greater velocity than truck x.

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.