1) On the periodic table, what name is given to the bottom number shown? a) Atomic number b) Mass number 2) Which two particles are found in the nucleus of an atom? a) Proton and electron b) Proton and neutron c) Neutron and electron 3) Where are the electrons located in an atom? a) Shells b) Nucleus c) Protons d) Neutrons 4) In an atom, which particles are always present in equal numbers? a) Protons and neutrons b) Electrons and neutrons c) Protons and electrons 5) What is the central part of an atom called? a) Neutron b) Proton c) Nucleus d) Shell e) Electron 6) How do you work out the number of protons in an atom's nucleus? a) Look at the mass number b) Look at the atomic number c) Subtract the atomic number from the mass number 7) On the periodic table, what name is given to the top number shown? a) Atomic number b) Mass number 8) What does the atomic number tell us? a) Number of protons in the nucleus b) Number of electrons in the shells c) The position of the element in the periodic table d) All three 9) How many electrons can fit into the first shell of an atom? a) 2 b) 4 c) 6 d) 8 10) How do you work out the number of neutrons in an atom's nucleus? a) Look at the mass number b) Look at the atomic number c) Subtract the atomic number from the mass number 11) How do you work out the number of electrons in an atom's shells? a) Look at the mass number b) Look at the atomic number c) Subtract the atomic number from the mass number 12) How many electrons can fit into the second / third shells of an atom? a) 2 b) 4 c) 6 d) 8 13) Carbon has an atomic number of 6. What is its electronic structure? a) 2,2,2 b) 1,5 c) 2,4 d) 4,2 e) 6 14) Phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it have? a) 15 b) 16 c) 31 15) What name is given to atoms of the same element that have different numbers of neutrons in their nuclei? a) Isobars b) Isotopes c) Isomers

Atomic structure

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