What causes an atom to be neutral?

a. equal number of protons and neutrons

b. equal distance between the nucleus and electrons

c. equal number of electrons and protons

d. equal distribution of electrons

In terms of energy how would you classify the following chemical reaction?

What is the motion of the negative electrons and positive atomic nuclei caused by the external field?

A fugitive tries to hop on a freight train traveling at a constant speed of 5.5 m/s. Just as an empty box car passes him, the fugitive starts from rest and accelerates at a = 2.5 m/s2 to his maximum speed of 8 m/s.

Is there a dark side of the moon? (note: this question can be effectively answered either yes or no, so it is important to explain your reasoning?

Which of the following plant adaptations protects grassland plants from grazers?

The majority of pelagic sediments are of which type? A. Terrigenous B. Biogenous C. Hydrogenous D. Cosmogenous

I can't figure this out, I could use an explanation too! A speeding truck travels in the positive x direction. It hits a car traveling in the positive y direction. The vehicles are deformed and travel together at an angle θ with the positive x-axis.

Based on your knowledge of the electromagnetic spectrum, why are radio waves considered harmless while ultraviolet waves and x-rays considered harmful?

What is great summary in physical science?

Does ice melt faster in water or air