Challenging game

Which of the following pairs of particles has the same number of electrons?
(note p. 4)

• Ca²⁺ and P^3–

• Mg²⁺ and Ar

• He and F^–

• Ne and P^3–

What is the number of electrons in a Ca atom?
(sing and think)

• 16

• 18

• 20

• 22

What is the number of electrons in a Ca²⁺ ion?

• 16

• 18

• 20

• 22

What is the number of electrons in a P^3- ion?

• 16

• 17

• 18

• 19

Atoms can obtain the stable electronic arrangements of atoms of _______ by gaining or losing electrons.

• halogens

• noble gases

• alkali metals

Sodium atoms are _______ sodium ions.

• equal to

• not equal to

Atom X is a group III element. The ion of X is

• X⁺

• X²⁺

• X³⁺

• X^2-

• X^3-

Atom X is a group VI element. The ion of X is

• X⁺

• X²⁺

• X³⁺

• X^2-

• X^3-

Atom X is a group V element. The ion of X is

• X⁺

• X²⁺

• X³⁺

• X^2-

• X^3-

An oxide of X is X₂O₃. The ion of X is

• X⁺

• X²⁺

• X³⁺

• X^2-

• X^3-