A new compound was recently discovered and found to have an atomic weight of 342.38 amu. This element has two isotopes, the lighter of which has a mass of 340.91 amu and an abundance of 68.322%. What is the mass of the heavier isotope?

In which orbital below would an electron (on average) be farthest from the nucleus?

Identify the characteristics of a gas.

How many electrons are in a neutral atom of astatine-211?

How many sublevels are contained in the second shell (n = 2) of a given atom?

What is the maximum number of p orbitals that are possible in a given shell?

How many atoms of carbon are in 2.50 moles of CO2?

Which element has the highest first ionization energy?

Which ion has the largest radius?

How many photons are contained in a burst of yellow light (589 nm) from a sodium lamp that contains 616 kJ of energy?