2. Atoms & Elements

Which element forms an ion with an electron configuration of [Ar] and a 2− charge?

When water molecules undergo auto-ionization, which ions are released?

Which of the following is the most stable ion commonly formed by phosphorus?

Which of the following is an example of an ion?

Which of the following correctly represents the charge and symbol for an oxide ion?

When iron forms the ionic compound FeCl_3, how many electrons does the iron ion have?

Which of the following ions is positively charged and is responsible for making a solution acidic?

What is the charge on the hydronium ion (H_3O^+)?

In the compound Cr3(PO4)4, which species is the cation and which is the anion?

Which process must occur for aluminum to form the ion Al^{3+}?

What must happen to an atom of magnesium in order to become a magnesium ion, Mg^{2+}?

Which of the following best describes the difference between cations and anions?

Which element forms an ion with an electron configuration of [Kr] and a 2− charge?

Which type of atoms typically form cations?

An anion has a(n) _____ charge.