How many protons, neutrons, and electrons are there in one ion of  77Se2- ?

Which of the following compounds exhibits pure (nonpolar) covalent bonding?

The shortest player in NBA history, Muggsy Bogues, stood 5 feet, 3 inches tall.  How many carbon atoms would you need to stack on top of each other in order to reach this height? (The diameter of a carbon atom is 67 pm, 1 ft = 12 in, 1 in = 0.0254 m).

What is the likely chemical formula of the compound formed between zinc and phosphorus?

What is the mass percentage of C in the compound, CH4?

What is proper syntax to find the probability that a randomly selected exam will require more than 15 minutes to grade?

Which of the following is an intensive (bulk) property of matter?

The empirical formula of a compound is C7H5O2. If the molecular mass of this compound is242 amu, what is its molecular formula?

When the following equation is balanced properly with whole number coefficients, what is the coefficient in front of oxygen (O2)? C4H10 + O2  

The wavelength of a red laser pointer is 632.8 nanometers (nm). What is this wavelength in micrometers (µm)?