Elements on the periodic table are organized by what?

increasing atomic number

decreasing atomic mass

increasing valence electrons

decreasing neutron count

The quantum mechanical model of the atom

As a star gives off energy in a thermonuclear reaction, the mass of the star 1. decreases 2. increases 3. remains the same

When the [H+] in a solution is 1.7 * 10-9 M, what is the pOH

The speed of a wave is 65m/sec. if the wave length of the wave is 0.8 what is the frequency of the wave

Mastering chemistry if the new ring is indeed pure platinum (density = 21.4 g/cm3), what is its mass?

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.

what mass of magnesium is required to react with excess nitrogen to produce 0.500 mol magnesium nitrade

Silver chromate is sparingly soluble in aqueous solutions. the ksp of ag2cro4 is 1.12 * 10-12 m3. what is the solubility (in mol/l) of silver chromate

What do you think 1,5-pentanedithiol C5H12S would smell like