Understanding Atoms and Ions

What is the charge of an atom when the number of protons equals the number of electrons?

• Neutral

• Variable

• Positive

• Negative

What is a cation?

• A neutral atom

• A negatively charged ion

• A positively charged ion

• An atom with more electrons than protons

How many electrons does a calcium ion with a 2+ charge have?

• 20

• 18

• 22

• 16

If an oxygen ion has a 2- charge, how many electrons does it have?

• 12

• 6

• 8

• 10

What is the charge of a sodium ion?

• 2-

• 1-

• 1+

• 2+

How many electrons does a manganese ion with a 4+ charge have?

• 19

• 29

• 21

• 25

What is the atomic number of iodine?

• 52

• 54

• 55

• 53

How many electrons does an iodide ion with a 1- charge have?

• 52

• 53

• 54

• 55

What is the charge of a phosphorus ion with 18 electrons?

• 2+

• 3-

• 3+

• 2-

How many protons does phosphorus have?

• 15

• 18

• 12

• 20