2. Atoms & Elements

Which of the following correctly describes a positive ion and a negative ion?

When a Mg^{2+} ion becomes a Mg atom, the radius increases because the Mg^{2+} ion:

What occurs when a magnesium atom becomes a magnesium ion?

After the transfer of the electron, sodium will form an ion with __________.

If an element gives away an electron, what type of ion does it form?

If an unknown monatomic ion has a 3- charge and contains 10 electrons, what is the identity of the ion?

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?