Can protons be gained or lost in an element?

Which of the following elements would you expect to be most reactive, based on the number of valence electrons it has? A. Magnesium (Mg) B. Sodium (Na) C. Aluminum (Al) D. Sulfur (S)

On March 21, a stick casts the following shadow. What is the most likely time of day? March 21 Shadow of stick Overhead Projection 9:00 AM 12:00 Noon 3:00 PM 7:00 PM

Which do you think will penetrate farther into a block of lead, x-rays, or gamma rays

05.04 MC) Which statement describes the motion of the sun? Group of answer choices The sun rotates at the same rate throughout. The sun does not rotate at its poles. Different parts of the sun rotate at different rates.

Ans of physics numerical : a body of mass100 cm cube weighs 5 kgf in air. It is completely immersed in a liq of density 1.8 * 1000kgmcube. Find upthrust due to liq and weight of body in liq

Use the graph of distance versus time to complete the sentences. The cars on the higher track travel the cars on the lower track, in the same time. This means that the cars on the higher track have a average speed than those on the lower track.

List at least 3 physical properties that the professor describes of his newly discovered flubber

7. Who is Mara Grunbaum?

How much work is done in holding a 10 newton sack of potatoes while waiting in line at the grocery store for 3 minutes.

Define light year and explain how and why light years are used to measure distances in the universe