Bell Ringer #10

How do you find the number of neutrons?

• look at the atomic number
• look at the atomic mass
• subtract the atomic number from the mass (rounded to the nearest whole number)

How many electrons does this element have?

• 34
• 22.990
• 12
• 11

How many neutrons does this element have?

• 5
• 13
• 9.012
• 4

What is the number below the element name in this picture called?

• atomic number
• protons/electrons
• atomic mass
• chemical formula