1) What is an atom's mass number? a) The number of protons and neutrons in the cloud of an atom. b) The number of electrons around the nucleus. c) The number of protons and neutrons in an atom d) the number of electrons in the nucleus of the atom. 2) What is the atomic number of an atom? a) The number of protons in the nucleus b) The number of nuclei in the atom c) The number of neutrons in the nucleus d) The number of electrons in the nucleus 3) What is an isotope? a) atoms with the same atomic number but a different atomic mass b) atoms with different atomic numbers and the same atomic mass c) atoms that have the same number of neutrons d) atoms that have different number of electrons. 4) The atomic number of iron is a) 26 b) 56 c) 82 d) 30 5) The mass number of iron is a) 26 b) 56 c) 82 d) 30 6) The number of protons in iron is a) 26 b) 56 c) 82 d) 30 7) The number of neutrons in iron is a) 26 b) 56 c) 82 d) 30 8) How many neutrons in an isotope with atomic number= 9 and mass number = 18? a) 27 b) 10 c) 9 d) 8 9) How many neutrons in an isotope with mass number = 99 and atomic number = 43? a) 142 b) 43 c) 99 d) 56 10) What is the mass number of an element that has 10 protons and 11 neutrons?  a) 10 b) 11 c) 20 d) 21 11) What is the atomic number of an atom that has 11 protons, 12 electrons, and 11 neutrons? a) 12 b) 11 c) 21 d) 22 12) What is the mass number of an atom that has 12 electrons, 11 protons, and 11 neutrons? a) 23 b) 1 c) 22 d) 21

Practising atomic and mass numbers

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