2. Atoms & Elements

In a water molecule, the oxygen atom has a ______ charge and the hydrogen atoms have a ______ charge.

What is the charge of a potassium ion (K^+)?

Which of the following best describes a hydronium ion?

In order to have a positive charge, an atom must have ________.

Which ions are formed when Sr(CH3COO)2 dissociates in water?

Which is a characteristic of all ions?

When writing the formula for an ionic compound, why must the total positive and negative charges balance?

What is the most common charge on a cobalt ion in the compound CoCl2?

When an atom of magnesium (Mg) loses two electrons, which ion is formed?

A positive ion forms when an atom ______.

Which term describes the process whereby an atom or molecule gains or loses electrons to become an ion?

What is the charge on a chloride ion?

Which pair of ions would experience an electrostatic force of attraction between them?

How many electrons are present in a P^{2+} ion?

Which ions are present in an aqueous solution of NiCl_2?