In which of these statements are protons, electrons, and neutrons correctly compared

12. The number of protons and neutrons tells us: | a. The principle quantum number b. The reactivity of the element e C. The atomic mass d. The atomic number . Both a and c

Which nuclide is used to investigate human thyroid gland disorders? (1) carbon-14 (3) cobalt-60 (2) potassium-37 (4) iodine-131

The enthalpy of a reaction is + 270 kJ/mol. What can you determine about the reaction? O A. It is spontaneous. O B. It is endothermic. O C. It is nonspontaneous. O D. It is exothermic.

What is the abbreviated electron configuration of cobalt?

Consider an atom of oxygen in which the nucleus contains 8 protons and 8 neutrons. If it is doubly ionized, what is the charge of the oxygen ion and how many electrons remain in the ion?

Using the equation below, calculate the number of grams of H2O that are formed from the reaction of 34.0 g of NH3. 4NH3 + 3O2 - -> 2N2 + 6H2O

Consider the chemical equation for the production of water: 2 H2+O2>2 H2O. If 100 grams of oxygen gas are used, what would the percent yield be if 75 g of H2O was produced?

Equal amounts of four gases are placed in identical containers at the temperatures that are noted below. Samples of Gases at Different Temperatures Gas Temperature (° c. P 10.2 Q 25.4 R 25.9 S 33.

A gas occupies a volume of 458 mL at a pressure of 1.0 1K PA and temperature of 295K. when the pressure is changed the volume becomes 500 mL. if there has been no change in temperature what is the new pressure?

True or false Opaque materials always appear to be white.