Which of the following states that two electrons can occupy the same orbital only if they have opposite spins? Hund's rule Dalton's theory Aufbau principle DeBroglie's theory Pauli exclusion principle

What element in the 3rd period will form an ionic compound with a 1:1 atom ratio with magnesium?

How many electrons does carbon lack in its outer shell? biochemistry

What is the proper name for MgSO4 7H2O? A. Magnesium sulfate heptahydrate B. Manganese sulfate hexahydrate C. Magnesium sulfite dihydrate D. Magnesium sulfite heptahydrate

Litmus paper strips were dipped in two different unknown liquids. The table below shows the pH of the two liquids: Litmus Test for Unknown Liquids Litmus Paper Strip pH of Liquid X 9 Y 4 What will happen to the litmus strips?

What are the units used to measue heart rate?

Which statement regarding water is true? Energy must be given off in order to break down the crystal lattice of ice to a liquid. Hydrogen bonds are stronger than covalent bonds. Liquid water is less dense than solid water.

Which of the following elements has the fewest valence electrons?. a. beryllium. b. boron. c. carbon. d. lithium

How many molecules are in 4.50 moles of H2O? A. 450 molecules B. 6.02 x 1023 molecules C. 2.71 x 1024 molecules D. 3.00 molecules

A sample of pure calcium fluoride with a mass of 15.0 g contains 7.70 g of calcium. How much calcium is contained in 45.0 g of calcium fluoride

If the mass of a material is 111 grams and the volume of the material is 11 cm3, what would the density of the material be?