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

Define the following terms: Chemical Energy- Stored Chemical Energy- Gravitational Potential Energy- Mechanical Energy-

Why is it important for scientists to measure how much precipitation is falling across the world?

Most of the energy released by nuclear fission is in the form of: alpha rays, beta rays, or gamma rays?

Match these items. 1. Ca 2. H2O 3. nuclear decay 4. nuclear synthesis 5. η 6. positive charge 7. e 8. number of protons in nucleus proton atomic number element compound fission electron neutron fusion

Two square pieces of cardboard x, y which are placed horizontally so they are affected by atmospheric pressure, If the area of x is four times that of y, compare between the values of: 1.

what is a possible unit for the product VI, where V is the potential difference across a resistor and I is the current through the same resistor?

What is one basic need that both monkey and a tree have in common

Which statement is true about the centripetal force acting on a body moving at a constant speed in a circle? A. It has no centripetal force. B. It has a centripetal force that is directed radially and outward. C.

Which of the following astronomical bodies is the highest in hierarchy earth galaxy solar system star

The force is proportional to what measurement