1) Atoms of the same chemical element which have the same number of ........ but different number of ......... a) protons neutrons b) neutrons protons c) neutrons electrons d) elextrons protons 2) Atoms of the same chemical element with the same ......... number but different ......... number. a) mass atomic b) atomic mass c) mango 67 d) atomic ass 3) There are two types of isotopes: ........ which don’t decay and ........... isotopes that emit radiation energy or particles. a) stable isotopes, radioactive b) radioactive, stable isotopes 4) Which isotope has only one neutron a) deuterium b) tritium c) protium 5) The number above Helium is: a) mass number b) atomic number c) electron number d) proton number 6) the number under helium is a) mass number b) atomic number c) neutron number 7) How to calculate the number of neutrons in isotopes: a) n° = A − Z b) n° = A / Z c) n° = Z − A

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