2. Atoms & Elements

Which ions are present in the compound Na2SO4?

Which of the following best describes a positive ion?

What is the charge of a single chloride ion?

In a formula unit of MnO, the total oxide ion charge is 2–. What is the charge on each manganese ion?

Why do atoms gain or lose electrons?

Which type of elements typically form anions?

When forming a compound, sodium loses electrons. What is the resulting charge on the sodium ion?

Which of the following represents the composition of the ion typically formed by magnesium?

What is the charge of an atom with 15 protons and 18 electrons?

A positively charged ion has one or more __.

What is the charge on a sodium ion (Na^+)?

An atom or a molecule with either a positive or negative charge is called a(n):

Which statement best describes the species XO_2^- that is dissociated from HXO_2 in aqueous solution?

Why does sodium form a +1 charge when it becomes an ion?

Nonmetallic elements form ions by doing which of the following with their valence electrons to complete their outer shell?