The periodic table is based on an element's

A. molecular mass.

B. atomic mass.

C. molecular size.

D. atomic number.

Which of the following mixtures can be a buffer? Group of answer choices ammonia and ammonium acetate potassium nitrate and nitric acid potassium nitrite and nitrous acid sodium chloride and hypochlorous acid

Which of the following has the greatest first ionization energy: F, Li, Rb, or Fr? A. Li B. F C. Rb D. Fr

A 250.0 ml buffer solution is 0.250 M in acetic acid and. 250M in sodium acetate. what is the ph after addition of. 0050 mol of HCL? what is the ph after the addition of. 0050 mol of NaOH?

Why do we stir iced tea after we put sugar in it

What is the relationship between genes, chromosomes, and DNA? How are they organized inside of a cell?

Which of the following is true concerning the noble gases? A. Their highest occupied s and p sublevels are filled. B. They belong to Group 8A. C. They are sometimes referred to as the inert gases. D. all of the above

Which of the following is responsible for passing albinism from a parent organism to its offspring?

Rubidium has two naturally occurring isotopes, rubidium - 85 (atomic mass = 84.9118 amu; abundance = 72.15%) and rubidium - 87 (atomic mass = 86.9092; abundance = 27.85%). Calculate the atomic weight of rubidium

You are asked to analyze an aqueous solution (X) and determine what's in it. You pour some of your sample X into a test tube and add a few drops of an acid. No observable reaction occurs.

Which of the following items represents a chemical change? burning melting evaporation freezing