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 relative masses of protons, neutrons and electrons?respectively a) P=1 , N=1 , E=0. b) P=1 , N=1 , E=1 c) P=1 , N=0 ,E=1 9) What are the charges for: Protons , neutrons and electrons? respectively a) positive , negative , neutral b) positive , neutral , negative c) negative , positive , neutral 10) These atoms of oxygen are called? a) NEUCLEUS b) ISOTOPES c) COMPOUNDS d) ELECTRONS 11) What does atomic number represent? a) number of neutrons b) number of protons c) number of electron 12) what does mass number represent? a) protons + electrons b) electrons + neutrons c) protons + neutrons

ISOTOPES

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