Across
- 3. Neutral subatomic particle present in the nucleus of the atom. Relative mass of 1.
- 4. A row of the periodic table. Elements in the same period have the same number of electron shells.
- 7. forces which exist between molecules. The strength of the intermolecular forces impact physical properties like boiling/melting point.
- 9. Positively charged subatomic particle present in the nucleus of the atom. Relative mass of 1.
- 13. Unreactive. The noble gases are also described as being inert.
- 14. number of protons in the nucleus.
- 15. The smallest part of an element that can exist. All substances are made up of atoms. Atoms contain a positively charged nucleus surrounded by negatively charged electrons.
- 16. The strong forces of attraction between oppositely charged ions.
- 18. Elements that react to form positive ions. Found to the left and towards the bottom of the periodic table.
Down
- 1. Particles smaller than an atom. Protons, neutrons and electrons are the three most common subatomic particles.
- 2. Table of elements arranged in order of increasing atomic number and such that elements with similar properties are in the same column (group).
- 5. A column of the periodic table. Elements in the same group have similar chemical properties.
- 6. charged object composed of protons and neutrons at the centre of every atom with one or more electrons orbiting it.
- 8. The elements in Group 0 of the periodic table. They have a stable full outer shell of electrons which makes them very unreactive.
- 10. Negatively charged subatomic particle which orbits the nucleus at various energy levels. Very small relative mass (negligible).
- 11. Elements that react to form negative ions. Found towards the right and top of the periodic table.
- 12. Different energy levels in atoms, occupied by electrons.
- 17. Atoms of the same element with the same number of protons but a different number of neutrons.