2. Atoms & Elements

Which of the following ions is not isoelectronic with the others?

What is the term for an atom or molecule that has more protons than electrons?

When an atom gains electrons to become a negative ion (anion), how does its size change compared to the neutral atom?

When water ionizes, it produces an ion with a positive charge and an ion with a negative charge. Which pair of ions is formed?

Which one of the following elements will most readily form an ion with a 1- charge in an ionic compound?

What is the most common ionic charge of an aluminum ion?

Atoms with the same number of protons but with different electrical charges are called:

How many electrons are present in an Al^{3+} ion?

What is the name given to an atom that gains or loses electrons in a chemical reaction?

What is the charge of the hydronium ion (H_3O^+)?

Which ion does sulfur most commonly form in ionic compounds?

Magnesium has an atomic number of 12. What is the most stable charge for a magnesium ion?

Which type of elements typically form negatively charged ions (anions)?

Why can't ions typically travel through the cell membrane?

What type of ion is formed when an element loses an electron?