Counting Subatomics & Isotopes

How many protons are in lead?

• 207
• 82
• 298
• 125

How many neutrons are in sodium?

• 23
• 11
• 34
• 12

How many electrons are in barium?

• 56
• 137
• 193
• 81

What does the atomic mass stand for?

• number of protons
• number of electrons
• number of neutrons
• number of protons and neutrons

What does the atomic number stand for?

• number of protons
• number of neutrons
• number of electrons
• number of protons and neutrons

If you know the atomic number of an element, what other two values do you know?

• the number of protons, the number of neutrons
• the number of protons, the number of electrons
• the atomic mass, the number of protons
• the number of neutrons, the number of electrons

How many protons are in cobalt?

• 27
• 59
• 32
• 86

What is the atomic number for nickel?

• 59
• 28
• 31
• 87

How many neutrons are in chlorine?

• 52
• 35
• 17
• 18

What is the atomic mass of osmium?

• 76
• 190
• 266
• 114