In Mendeleev's version of the periodic table, the elements were arranged in order of increasing atomic number.

Select the correct electron configuration for sulfur (Z = 16).

State Hund's rule, and show how it applies to the ground state of phosphorus atoms.

The most acidic oxides are formed from elements found in the _________________ region of the periodic table.

According to the exclusion principle, two is the maximum number of electrons in an atom which can share the same four quantum numbers.

Select the element with the least metallic character.

An element with the electron configuration [noble gas]ns²(n - 1)d⁸ has ___________ valence electrons.

Elements with _______________ first ionization energies and ___________ electron affinities generally form anions.

Which of the following ions will be most likely to form when selenium ionizes?

Which of the following elements is paramagnetic?

Which of the following elements has the largest first ionization energy?

Which of the following elements has the smallest first ionization energy?

Identify the element of Period 2 which has the following successive ionization energies, in kJ/mol.
IE₁, 1314 IE₂, 3389 IE₃, 5298 IE₄, 7471
IE₅, 10992 IE₆, 13329 IE₇, 71345 IE₈, 84087

Write down the full electron configuration for ground state atoms of:
a.   element number 12.
b.   element number 23.
c.   element number 32.

Which of the following atoms will be diamagnetic?