31. The mass number of a nucleus is:

a) always less than its atomic number: b) the sum of the number of protons and neutrons present in

the nucleus; c) always more than the atomic weight; d) a fraction.

Sonya reads the element riddle below. I am shiny. I form + 1 ions. There's more! I am the most reactive metal in Period 4. Who am I? Which element is the answer to the riddle? krypton potassium sodium bromine

Which of the following, when added to an equilibrium mixture represented by the equlibrium below, will not alter the composition of the original equilibrium mixture? Mg (OH) 2 (s) Mg2 + (aq) + 2OH - (aq) A.

Is "diamonds are the hardest known substance" a physical property?

6. Why are ionic substances not known as molecules?

What are the three sources of solid waste

When you overshoot during titration what is the result

The transmission of heat requiring the movement of a liquid or a gas is A. transduction. B. convection. C. radiation. D. conduction

The molecular formula HOH is an example of an

Which choice is an example of an endothermic process? . conversion of steam to ice . conversion of steam to water . conversion of water to ice . conversion of ice to steam

Cobalt chloride hexahydrate has a formula weight of 237.9 g/mol. how much would you use to make 0.5 liter of a 0.3 m solution?