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Atomic Number and Isotopes quiz

Test your knowledge of Atomic Number and Isotopes

1. Which of these is always true of atoms?
a) Atoms are the same as molecules
b) They are always bonded to another atom
c) They sometimes have a charge
d) They are always neutral

2. The atomic number........
a) indicates the number of neutrons in an atom
b) indicates the number of protons in an atom
c) is just a catalogue number
d) indicates the number of protons and number of neutrons

3. An isotope is......
a) when an element has the same number of protons but a different number of electrons
b) the same element
c) an atom of an element which has the same atomic mass but different atomic number
d) an atom of an element which has the same atomic number but different mass number

4. An element has mass number 40 and mass atomic number 20, how many electrons has it?
40
20
60
80

5. What name is given to a hydrogen atom with 1 proton and 1 neutron?
deuterium
hydrogen
tritium
dihydrogen oxide