2. Atoms & Elements

In a neutral compound formed from aluminum ions (Al^{3+}) and sulfide ions (S^{2-}), what is the simplest whole-number ratio of Al ions to S ions?

How many electrons are present in a sulfur anion with a -2 charge?

What is the charge on an atom after it gains two electrons during the formation of a bond?

What is the net ionic charge of a calcium ion (Ca^{2+})?

Which ions are formed when MgI_2 dissociates in water?

How does a chlorine atom become a negatively charged ion?

What is the correct name for the ion S^{2-}?

Which process leads to the formation of a cation from a neutral atom?

When calcium (Ca) forms an ion, does it gain or lose electrons, and what is the resulting charge?

Which one of the following atoms is most likely to form an anion with a charge of -1?

Which process must an atom undergo to become a negative ion?

Which type of elements typically form anions?

Which of the following ions has a positive charge?

Which of the following actions would convert a carbide ion (C^{4-}) into a neutral carbon atom?