Isotopes and Elements Practice Problems by Tyler Dewitt

What is the chemical symbol for sodium?

• K

• Mg

• Na

• So

What is the isotope name for an atom with a mass number of 22?

• Nitrogen 22

• Oxygen 22

• Sodium 22

• Carbon 22

How many protons does a sodium atom have?

• 10

• 13

• 11

• 12

What is the net charge of a ruthenium atom with 44 protons and 56 neutrons?

• 1-

• 3-

• 4+

• 2+

What is the chemical symbol for iodine-131 with a negative charge?

• I

• I-131

• In

• I-132

How many neutrons does an iodine-131 atom have?

• 81

• 80

• 79

• 78

What is the isotope name for an atom with 12 protons and 13 neutrons?

• Potassium 25

• Magnesium 25

• Aluminum 25

• Sodium 25

What is the net charge of a magnesium atom with 12 protons and 10 electrons?

• 1-

• 2+

• 1+

• 2-