Gap-fill exercise

43:52
Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1.Mass number of an atom is the of the number of protons and neutrons in the nucleus of an atom of an element.
2. Mass number of an atom is sometimes called its
3. Different atoms of the same element which have the same atomic number but different mass number are referred to as
4. Isotopes have the same chemical properties since they have the same numbers.
5. The arrangement of electrons in the energy levels of an atom is said to be its
6. A particle formed when an atom gains electrons is referred to as an/a
7. are formed when atoms either lose or gain electrons
8. The process by which atoms combine by transfer or share electrons to form stable electronic structures is referred to as
10. The type of bonding that involves complete transfer of electrons from one atom or group of atoms to another atom or group of atoms is called
11. Covalent bonding involves the sharing of electrons between atoms in
12. A metallic bond is due to the attraction between metal ions and a pool of
13. In metals, no particular electrons are attracted to particular metal ions. These electrons are said to be
14. Metals are good conductors of heat and electricity because they have electrons.
15. Simple molecular substances have low melting and boiling points because their molecules are held together by weak forces of attraction.
16. Which group metal carbonates do not decompose on heating?
17. Which group of elements in the periodic table is called the halogens?
18. Which group of the periodic table consists of alkali earth metals?
19. Which group of the periodic table consists of the noble gases?
20. Which group of the Periodic table consists of metalloids?
21. Which group of the Periodic table consists of the most reactive metals?
22. Which group of the Periodic table consists of the most reactive non-metals?
23. Which group of the Periodic table consists of non reactive elements
24. is the decomposition of an electrolyte passing an electric current through it and is decomposed by it.
25. The discharge of ions during electrolysis takes places at poles known as
26. is the positively charged electrode by which electrons leave the electrolyte.
27. The discharge of an ion at an electrode depends on the of the ion in the electrochemical series.
28. During the electrolysis of acidified water, is produced at the cathode while is produced at the anode.
29. When molten lead (II) bromide is electrolysed, is given off at the anode.
30. When copper (II) sulphate solution is electrolysed used copper electrode, is formed at the cathode
31. When copper (II) sulphate solution is electrolysed using carbon electrodes, is formed at the cathode.
32. Solid sodium chloride is non-electrolyte because it lacks electrons
33. Electrolysis of brine is not good to the environment because it releases to the environment.
34. The conducting species in conductors are while those in electrolytes are
35. Electrolysis of is used in the manufacture of sodium hydroxide while electrolysis of is used in the preparation of oxygen in the laboratory.
36. During the purification of copper metal using electrolysis, the impure copper makes the
37. During the coating of a substance by silver metal using electrolysis, silver metal forms the