Ions, Isotopes and Relative Atomic Mass

What is the definition of an ion?

• A charged particle that has lost or gained electrons.

• A version of an atom with the same number of protons but different number of neutrons.

• A version of an atom with the same number of neutrons but different number of protons.

• A charged particle that has lost or gained protons.

What is the definition of an isotope?

• A charged particle that has lost or gained electrons.

• A version of an atom with the same number of protons but different number of neutrons.

• A version of an atom with the same number of neutrons but different number of protons.

• A charged particle that has lost or gained protons.

If an atom loses electrons, it becomes an ion with a ________ charge.

If an atom gains electrons, it becomes an ion with a ________ charge.

Metal atoms always ____ electrons to form ions.

• gain

• lose

Calcium has 2 electrons in its outer shell. What is the charge of a calcium ion?

• 2+

• 1+

• 1-

• 2-

Fluorine has 7 electrons in its outer shell. What is the charge of a fluoride ion?

• 2+

• 1+

• 1-

• 2-

Lithium has 1 electron in its outer shell. What is the charge of a lithium ion?

• 2+

• 1+

• 1-

• 2-

Isotopes of an element have the same atomic number but different mass numbers.

• True

• False

There are two isotopes of chlorine (Cl). Cl-35 has an abundance of 75% and Cl-37 has an abundance of 25%. Calculate the relative atomic mass of chlorine to 3 significant figures.