The modern-day quantum model of the atom is better than John Dalton's model because it is easier to understand. is a more recent theory. can be represented in two dimensions. answers many questions about atoms.

3. The temperature of a fixed mass of gas in a rigid container is decreased from 127.00 degrees Celsius to 27.0 degrees Celsius. The initial pressure was 1000. mmHg. What is the new pressure, in mmHg, after cooling?

Barium ions carry a 2 + charge, and nitrogen ions carry a 3-charge. what would be the chemical formula for the ionic compound barium nitride?

What is the resulting formula unit when magnesium and nitrogen bond

Spectrum of wavelength that range from approximately

Which isotope will spontaneously decay and emit particles with a charge of + 2? (1) 53Fe (3) 198Au (2) 137Cs (4) 220Fr

The element rubidium has two naturally occurring isotopes. The atomic mass of 85Rb (72.17 percent abundant) is 84.911794 amu. Determine the atomic mass of 87Rb (27.83 percent abundant). The average atomic mass of Rb is 85.4678 amu.

Describe what you can do to slow down, or stop the continuous negative human treatment of our aquatic biomes.

If the hydrogen ion concentration is 10-7M, what is the pH of the solution? Show all work.

When it is raining water is returning to earth as a water cycle stage called

How many moles are in 1.50 grams of ethanol, CH3CH2OH?