CHEMISTRY DEPARTMENT WAID ACADEMY

1. CHEMISTRY DEPARTMENT WAID ACADEMY Standard Grade Topic 3

2. 15 Which of the elements shown is a liquid at room temperature? • Silicon. • Bromine. • Oxygen. • Magnesium.

3. 20 Which of the elements shown is not naturally occurring? • Astatine. • Antimony. • Rubidium. • Gallium.

4. 15 What name is given to the elements in group 7 of the Periodic table? • Transition metals. • Alkali metals. • Noble gases. • Halogens.

5. 20 Why are the elements lithium, sodium and potassium in the same group in the Periodic table? • They were discovered by the same scientist. • They have a similar appearance. • They have similar chemical properties. • They are all found in sea water.

6. 20 The noble gases are • a family of very reactive non-metal elements. • a family of very reactive metal elements. • a family of very unreactive metal elements. • a family of very unreactive non-metal elements.

7. 10 Which of the elements shown below is an alkali metal? • Magnesium. • Copper. • Aluminium. • Lithium.

8. 15 Atoms are neutral as they contain • equal numbers of protons and electrons. • equal numbers of protons and neutrons. • equal numbers of electrons and neutrons. • neutrons which have no charge.

9. 15 Which element has an atomic number of 12? • Carbon. • Calcium. • Magnesium. • Manganese.

10. 15 The atomic number gives the number of • neutrons in an atom. • protons + electrons in an atom. • protons + neutrons in an atom.. • protons in an atom.

11. 15 In this atom, , there are • 79 protons + electrons. • 35 neutrons. • 79 electrons. • 44 neutrons.