CC3-4 The Periodic Table

Edit Answers
1234567891011121314151617181920212223
Across
  1. 3. Area around a nucleus that can be occupied by electrons, usually drawn as a circle (in ‘target diagrams’). Also called an electron energy level or an ‘orbit’.
  2. 5. Does not react.
  3. 6. What you think will happen in an experiment and why you think this.
  4. 7. A horizontal row in the periodic table.
  5. 10. Atoms of an element with the same number of protons (atomic number) but different mass numbers due to different numbers of neutrons.
  6. 12. Tiny particle with a negative charge that is found in shells around the nucleus of an atom.
  7. 16. The mean mass of an atom relative to the mass of an atom of carbon-12, which is assigned a mass of 12. The RAM (Ar) of an element is the mean relative mass of the isotopes in the element.
  8. 17. A vertical column of elements in the periodic table. Elements in the same group generally have similar properties.
  9. 18. The electric charge of a subatomic particle compared to the charge on a proton.
  10. 19. The smaller particles that make up atoms – protons, neutrons and electrons.
  11. 20. An average calculated by adding up the values of a set of measurements and dividing by the number of measurements in the set.
  12. 22. A positively charge subatomic particle in the nucleus of all atoms.
  13. 23. The positively charged centre of an atom.
Down
  1. 1. A simple substance made up of only one type of atom.
  2. 2. How a substance reacts with other substances.
  3. 4. The arrangement of electrons in shells around the nucleus of an atom.
  4. 8. Atoms are small particles from which all substances are made. They are the smallest neutral part of an element that can take part in chemical reactions.
  5. 9. The total number of protons and neutrons in the nucleus of an atom (symbol A). Also known as the nucleon number.
  6. 11. Electrically neutral subatomic particle found in the nucleus of most atoms.
  7. 13. The mass of a subatomic particle compared to the mass of a proton.
  8. 14. A description of how a material behaves and responds to forces and energy.
  9. 15. Chart in which the elements are arranged in order of increasing atomic number.
  10. 21. The number of protons in the nucleus of an atom (symbol Z). Also known as the proton number.