Isotopes

True or false: Isotopes have the same number of protons (and electrons), but a different number of neutrons.

• True

• False

What does the number at the end of isotope names mean? E.g. Carbon-12, Carbon-13, Carbon-14

• Mass number

• atomic number

• number of protons

• number of neutrons

Boron-10, Boron-11, and Boron-12 are all isotopes of the same element, with an atomic number of 5. How many neutrons does Boron-12 have?

• 6

• 7

• 2

• 12

If fluorine has an atomic number of 9, which isotope would have 10 neutrons?

• Fluorine-18

• Fluorine-19

• Fluorine-20

• Fluorine-21

A particular isotope of hydrogen has 1 proton and 3 neutrons. What will be the name of this isotope?

• Hydrogen-1

• Hydrogen-3

• Hydrogen-4

• Hydrogen-2

One of the isotopes of chlorine has 17 protons and 23 neutrons. What is the name of this isotope?

An isotope of Aluminium is aluminium-25. If aluminium has an atomic number of 13, how many neutrons does this isotope have?

Which of these are isotopes of the same element? (select more than one)

• oxygen-16

• nitrogen-16

• fluorine-16

• nitrogen-17

Which of these are isotopes of the same element? (select more than one).

• beryllium-9

• beryllium-8

• beryllium-7

• lithium-7

Which of these are isotopes of the same element? (select more than one)

• magnesium-23

• magnesium-31

• sodium-24

• magnesium-25