The difference in energies between the 1s and 2s orbitals is due to the penetration effect.
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Q7: First ionization energies of neutral atoms may
Q8: In forming ions of the first series
Q9: In Mendeleev's version of the periodic table,
Q10: Electron affinities become increasingly positive toward the
Q11: Electron affinities of neutral atoms may be
Q13: Hund's rule is used to predict the
Q14: A negative electron affinity implies that the
Q15: Which one of the following statements about
Q16: "Each electron in an atom must have
Q17: According to the exclusion principle, two is
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