C2 Topic 1

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An atom of sodium contains 11 protons, 11 electrons and 12 neutrons. The particles in the nucleus of the atom are

  • D.Neutrons only
  • C. Protons and neutrons
  • B. Electrons and neutrons
  • A. Protons and electrons

An atom of sodium contains 11 protons, 11 electrons and 12 neutrons. The relative mass of this sodium atom is

  • D. 23
  • C. 22
  • B. 12
  • A. 11

The electron configurations of carbon and oxygen are: Carbon 2.4, oxygen 2.6. Which row of the table shows the numbers of the groups in the periodic table in which carbon and oxygen are placed ?

  • A. Carbon in Group 4, Oxygen in Group 2
  • B. Carbon in Group 2, Oxygen in Group 3
  • C. Carbon in Group 4, Oxygen in Group 6
  • D. Carbon in Group 6, Oxygen in Group 4

All atoms of sodium contain the same number of

  • B. Molecules
  • C. Neutrons
  • A. Bonds
  • D. Protons

An atom of sodium contains 11 protons, 11 electrons and 12 neutrons. The electronic configuration of the sodium atom is

  • D. 8.1.2
  • C. 2.8.1
  • B. 2.1.8
  • A. 1.8.2

The symbol for an atom of magnesium is

  • A. M
  • B. Ma
  • D. Mn
  • C. Mg

Element S exists as two isotopes, mass sumber 10 and 11. A sample of S contains 20% of the isotope with mass number 10 and 80% of the isotope with mass number 11. What is the relative atomic mass of element S ?

  • A. 10.2
  • B. 10.5
  • C. 10.8
  • D. 21

The atomic number of chlorine is 17. The symbols for four different atoms, W, X, Y and Z, are shown. Which atoms are isotopes of chlorine ?


  • A. W and X
  • B. W and Y
  • C. X and Z
  • D. X and Y