Across
- 1. Orbitals of similar energy are grouped in subshells that are labelled _ _ _ _ _(5)
- 4. Atomic ______ is a measurement used for the size of atoms. It can be regarded as the distance from the nucleus to the outermost electrons (6)
- 5. When considering the formula of an ionic compound, the total number of ___________ charges on the metal ions must equal the total number of negative charges on the non-metal ions. (8)
- 8. The lattice of cations is surrounded by a sea of ____________ electrons. (11)
- 9. The _____ mass of an element or compound is the mass, in grams, of one mole of that element or compound. Molar mass is given the symbol M and the unit g mol–1. (5)
- 12. Have the same chemical properties but different physical properties such as mass, density and radioactivity (8)
- 13. When an electron falls from a higher energy shell to a lower energy shell, it emits energy in the form of ________ (5)
- 15. _______ compounds do not conduct electricity in the solid state. (6)
- 17. _________________ is the ability of an element to attract electrons towards itself (17)
- 18. _______ in the outer shell are called valence electrons (9)
- 19. The __________ formula of a compound gives the simplest whole number ratio of atoms or ions in the compound. (9)
- 21. From left to right across a period, the core charge of atoms _________, so the attractive force felt between the valence electrons and the nucleus increases. (9)
- 23. _________ bonding is the electrostatic force of attraction between a lattice of positive ions and delocalised valence electrons.(8)
- 24. An ______ is a mixture of a metallic element with other elements. (5)
- 25. Columns in the periodic table are known as ______ and are numbered 1–18. (6)
- 26. Molecular compounds have a molecular formula that gives the actual number of atoms of each element in the ___________. (9)
Down
- 2. The number of occupied electron shells of an atom of an element is equal to the number of the element’s ______ on the periodic table(6)
- 3. The particles that make up the crystal lattice are ______ and anions. (7)
- 5. Elements are organised into the______ _____(6,5)
- 6. When an ionic compound is formed from positively charged metal ions and negatively charged non-metal ions, the ions combine in proportions that produce an ionic compound with an overall _____ charge. (4)
- 7. The ________ model proposed that electrons behave as waves and occupy a three-dimensional space around the nucleus (11)
- 10. In water, ionic compounds vary from very soluble to insoluble. The ____________ depends on whether the forces between the water molecules and the ions in the lattice are strong enough to pull the ions out of the lattice. (10)
- 11. Transition metal compounds tend to be brightly __________. (8)
- 14. Ions that contain two or more atoms of different elements are called __________ ions. (10)
- 16. The experimental results of metals reacting with acids are used to place metals in an order of reactivity called the ___________ series. (11)
- 20. The relative molecular mass of molecules, or formula mass of ionic compounds, is calculated from the sum of the ________ atomic masses of its constituent elements. (8)
- 22. Down a group, the number of shells in an atom increases so that the valence electrons are further from the nucleus and are held less ________. (8)
- 26. A mole is a convenient quantity for counting particles. The mole is given the symbol n and the unit ___. (3)