How do elements change as you go down a group in the periodic table?

A. The average atomic mass decreases.

B. The atomic number increases.

C. The atoms become more metallic.

D. The number of valence electrons increases.

Students perform a probability experiment by throwing wads of a paper at a trash can 55.8 cm in diameter. What is the area of the trash can?

Which light consists of all the colors of the visible light spectrum?

A uniform drawbridge must be held at a 37 ∘ angle above the horizontal to allow ships to pass underneath. the drawbridge weighs 45,000 n and is 14.0 m long. a cable is connected 3.

What lies immediately under the phosphor layer of a psp storage plate?

What physical scientists study

An object has a mass of 8.00 kg. What is the gravitational force on the object by the earth?

Which of the following best characterizes the free energy change ΔG for an endothermic reaction under physiological conditions? A. The sign of ΔG is positive B. The sign of ΔG is zero C. The sign of ΔG is negative D.

In a recent hockey game, one player (m=100kg) was moving at a velocity of 8 m/s when he ran into another player (m=300kg) who was at rest (v=0m/s). After the collision, the two players were stuck together (moving with the same velocity).

In a laser, electrical energy is changed to light energy, and a small amount of the energy is wasted as heat. Describe the total amount of the heat in the system (using the conservation of energy).

What is the name for a star and planets held together by gravity? A. solar system B. galaxy C. black hole D. supernova