Helium-4 has how many protons

Is blacklight the same as ultraviolet?

An electromagnetic wave of frequency 10^21 Hz is best classified as _. A. a gamma ray B. a radio wave C. Visible light D. a microwave

if a cube that has a length height and width of 4cm is broken down into 8 cubes of equal size what is the surface area of the 8cm cubes

A coiled up wire carrying a current is called what?

Zirconium has an atomic number of 40. How many neutrons are there in an isotope of zirconium-92? A. 40 B. 52 C. 92 D. 132

What Is a mineral made of oxidized hydrogen

If you were to go to space, and took your helmet of the suit off while your out side of the rocket, what would happen?

In Step 5, you will calculate H+/OH - ratios for more extreme pH solutions. Find the concentration of H + ions to OH - ions listed in Table B of your Student Guide for a solution at a pH = 2.

The molecules of a substance are moving rapidly in a container. The molecules do not interact with each other. If the container is opened, the molecules will escape from the container. In what phase of matter are the molecules in the container?

Which prefix represents tenths in the metric system?