1) (a)Which one of the three particles has a negative charge? a) PROTONS b) ELECTRONS c) NEUTRONS 2) (b)Which one of the three particles has the smallest mass? a)  ELECTRONS b) NEUTRONS c) PROTONS 3) The atomic number of this atom is? a) 24.305 b) 12 4) The mass number of this atom is? a) 24.305 b) 12 5) The particle furthest from the centre of each atom is? a) PROTONS b) ELECTRONS c) NEUTRONS 6) The particle present in atom on the left but not in atom on the right side is? a)  proton b) neutron c) electron 7) Both atoms are neutral because they have the same number of? a) PROTONS AND ELECTRONS b) PROTONS AND NEUCLEUS c) ELECTRONS AND NEUTRONS 8) What are the charges for: Protons , neutrons and electrons? respectively a) positive , negative , neutral b) positive , neutral , negative c) negative , positive , neutral 9) These atoms of oxygen are called? a) NEUCLEUS b) ISOTOPES c) COMPOUNDS d) ELECTRONS 10) What does atomic number represent? a) number of neutrons b) number of protons c) number of electron 11) what does mass number represent? a) protons + electrons b) electrons + neutrons c) protons + neutrons 12) Which diagram shows the electronic configuration of an oxygen atom. a) b) c)

Year 9: ISOTOPES

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