2. Atoms & Elements

Which of the following correctly identifies the cation and anion present in the compound NH4Br?

Which of the following is the number of protons in the sulfide ion, S^{2-}?

What is the term for an ion that has a net negative charge due to having more electrons than protons?

Which ions are present in solid sodium chloride (NaCl)?

Which atom has the same number of electrons as a P^{3-} ion?

Which of the following best describes how an anion is formed?

What is the charge of the magnesium ion (Mg^{2+})?

Which of the following best describes the difference between a cation and an anion?

An atom of magnesium has lost two electrons. It is known as a(n) ________.

An atom that is ionized must have which of the following?

Which of the following describes how a neutral atom forms a positive ion (cation)?

Which ion has the same electron configuration as an atom of He?

Which of the following best describes a hydrogen ion?

In a neutral compound formed from Al^{3+} ions and S^{2-} ions, what is the ratio of Al^{3+} ions to S^{2-} ions?

When hydrogen atoms in a water molecule experience an unequal pull of electrons due to the electronegativity of oxygen, what is the resulting partial charge on each hydrogen atom?