2. Atoms & Elements

What happens to an atom when it gains an electron?

What is the charge on the ion formed by Na?

When a sodium atom loses an electron, what typically happens to the electron?

Which of the following lists all the ions present in the reactants when calcium chloride and sodium phosphate are dissolved in water?

Sulfur readily forms which of the following monatomic ions?

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?