As one goes from left to right in a period, which of the following is true?

A. The number of protons decreases.

B. The number of valence electrons increases.

C. both A and B

D. none of the above

How is the body a system of multiple interacting subsystem?

If a moose were chasing you through the woods, its enormous mass would be very threatening. But if you zigzagged, then its great mass would be to your advantage. Explain why.

Willie's class found that the cart will move when pushed with 50 Newton's of force. When Willie pushes on the cart with 10 Newton's of force, why didn't the cart move?

How do rechargeable batteries work differently from non-rechargeable ones?

A. How many protons are there in the nucleus of Cl-37? b. How many neutrons are there in the nucleus of Cl-37?

Why do you float in space

How does physical change affect the identity of a substance

A scientist pours grape juice on three identical white shirts He then uses three different cleaning products on the shirts and measures how clean they get what is the independent variable in this experiment

What part of the atom does nuclear radiation come from?

Why should scientists write reports and give oral presentations of the steps and results of their in investigations?