How many unpaired electrons are in the beryllium atom?
Answer: There are 0 unpaired electrons in the beryllium atom.
Explanation: Beryllium (Be), with an atomic number of 4, has an electron configuration of 1s2 2s2. In this configuration, both of the electrons in the 2s subshell are paired, meaning they have opposite spins. Since there are no unpaired electrons in the atom, beryllium is diamagnetic and does not exhibit magnetic behavior due to electron spins.