Isotopes Do-Now!

To calculate the mass number of an element, what two things should we add together?

• protons + electrons

• protons + neutrons

• electrons + neutrons

• we actually have to subtract to find the answer

If an element has 15 protons and 18 neutrons, what will its mass number be?

• 15

• 18

• 33

• 3

If an isotope of Carbon has 8 neutrons, what will the mass number of that isotope be?

• 16

• 8

• 14

• 12

To calculate the number of neutrons in an atom, what do we need to do?

• mass number + atomic number

• it's the same as the number of protons

• protons + electrons

• mass number - atomic number

If an isotope of Magnesium has a mass number of 22, how many neutrons does that isotope have?

• 10

• 12

• 22

• 24

Looking at the isotope symbol for copper, what is the atomic number?

• 63

• 29

What is the mass number for the isotope Nitrogen - 15?

• 14

• 15

• 16

• 7

How many neutrons does the isotope Fluorine - 18 have?

• 10

• 18

• 19

• 9

How many neutrons are in this isotope of Titanium?

• 48

• 22

• 26

If an isotope of Boron has 8 neutrons, how should we write out the name for that isotope?

• Boron - 8

• Boron - 11

• Boron - 5

• Boron - 13