Each of the diagrams below shows an electrically neutral atom. fill in the missing number of protons (n) neutrons (and), electrons (e), and atomic mass (m). then complete the questions in the space below

Thomson's experiments were significant in that they questioned A. whether matter is made up of atoms. B. whether the atom has a positive or negative charge. C. whether atoms will form compounds with other atoms. D.

And h is the half-life, in days, of the substance. a scientist has a 10-mg sample of a radioactive isotope. the isotope has a half-life of 8 days. after 16 days, how much of the radioactive isotope remains?

What mass of potassium hydroxide is formed when 8.2 g of potassium oxide is added to 1.3 g of water? answer key?

Which of the halide ions (f-, cl-, br-, and i-) is the most stable base? which is the least stable base?

Calculate the volume in liters of a 0.111 mol/L potassium dichromate solution that contains 125. mmol of potassium dichromate. Be sure your answer has the correct number of significant digits.

In the vertical columns of the periodic table, as the atomic numbers increase: a. the number of electron shells increases. b. the ionization energies increase. c. the number of electrons in the valence shell increases. d.

Which of the following solutions contains the largest total concentration of ions, assuming complete dissociation .010 M aluminum chloride .010M sodium chloride .010M aluminum sulfate .010M calcium chloride

What is the relationship between chemical equilibrium and the rates of forward and reverse reaction? a. In equilibrium, the forward reaction rate must be greater than the reverse reaction rate. b.

Choose all that apply: Living organisms use atoms from sugar molecules combined with other elements to form: Question 9 options: Lipids Metals Nonmetal atoms Nucleic Acids

12.5ml of 2.0m NaOH neutralizes 10ml og HCL, what is the acid concentration