How many unpaired electrons does an atom of oxygen have in its ground state?

Which ground-state atom corresponds to the orbital diagram below? 1s [↑↓]2s [↑↓]2p [↑↓][↑↓][↑↓]3s [↑↓]3p [↑↓][↑][↑]

What is the wavelength of radiation that has a frequency of 3.4 × 10¹¹ s⁻¹?

Ethanol has a density of 0.789 g/cm³. What is the volume of 7.89 g of ethanol?

Which one of the following sets of quantum numbers is possible?                 n l ml ms A 4 1 -2 +1/2 B 3 0 1 -1/2 C 3 1 +2 +1/2 D 2 1 1 -1/2 E 2 0 0 +1/2

A possible set of quantum numbers to describe an electron in a 3d subshell is:

A ground-state atom of cobalt (Co) has ___ unpaired electrons and is _____.

A sample of metal has a mass of 98.0 g. When placed in water, the level increases from 15.5 mL to 25.5 mL. What is the density?

A hot summer day reaches 104°F. Express this temperature in °C.

Thorium-232 decays by alpha emission. What is the decay product?