How many electrons would an atom need to have before it can begin filling the 3s sub level?

Oxygen has a total of three isotopes Oxygen-16, Oxygen-17, and oxygen-18. With their a. m. u. being 15.995, 16.999, and 17.999 respectively. The percent abundance for Oxygen-17 is 0.04% and Oxygen-18 is 0.2%.

What is the H3O + of a solution with a ph of 1.8

Joseph Priestley discovered and described the chemical properties of oxygen. What type of chemist would he be considered today?

Determine the volume of atmospheric air (at 14 lb/in.^2) needed to fill your bike tires (assuming it holds 500 mL of air) to the pressure recommended by the manufacturer (70 lb/in.^2)

Which of these alkyl halides cannot be used to prepare amines using gabriel synthesis? a. 1-bromopentane b. 1-bromo-3-methylbutane c. 2-bromo-3-methylpentane d. 1-bromo-2,3-dimethylbutane e. 2-bromo-2,3-dimethylbutane?

Hydrogen is 99% hydrogen-1; 0.8% hydrogen-2; and 0.2% hydrogen-3. calculate it's average atomic mass

Uranium-235 has a half-life of 713 million years. Would uranium-235 or carbon-14 be more useful for dating a fossil from Precambrian Time? Explain.

Earth's oceans contain many dissolved elements like calcium, sodium, and chlorine. These elements plus several others combine to form the salts in the oceans.

What is physical change in chemistry?

Testable question: does the water need to be hot or cold to make a cloud. What data can I use for my science project