2. Atoms & Elements

How many electrons are present in an oxide ion (O^{2-})?

Which two ions are present in the greatest abundance in table salt (NaCl)?

Which of the following ions has a negative charge?

Which of the following statements is true about ions?

Which of the following best describes how an ion differs from an atom?

Why is a sodium ion (Na+) positively charged?

When a sodium atom loses one electron, it becomes positively charged. What is the correct name and symbol for this ion?

In a sample of sodium chloride (NaCl) that has completely dissociated in water, what is the ratio of sodium ions (Na^+) to chloride ions (Cl^-) present in the solution?

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

Which of the following is the correct formula for a potassium ion that has 18 electrons?

Which of the following best explains why the Na^+ ion is smaller than a neutral Na atom?

What ion is formed when an atom of magnesium (Mg) loses two electrons?

Ions are described as ________ if they have the same number of electrons.

Why do cations have a positive charge?

Which of the following atoms or ions is NOT isoelectronic with the others?