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CHEMISTRY DEPARTMENT WAID ACADEMY. Standard Grade Topic 3. 15. Which of the elements shown is a liquid at room temperature?. Silicon. Bromine. Oxygen. Magnesium. 20. Which of the elements shown is not naturally occurring?. Astatine. Antimony. Rubidium. Gallium. 15.

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CHEMISTRY DEPARTMENT

WAID ACADEMY

Standard Grade

Topic 3

what name is given to the elements in group 7 of the periodic table

15

What name is given to the elements in group 7 of the Periodic table?
  • Transition metals.
  • Alkali metals.
  • Noble gases.
  • Halogens.
why are the elements lithium sodium and potassium in the same group in the periodic table

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.
the noble gases are

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.
atoms are neutral as they contain

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.
which element has an atomic number of 12

15

Which element has an atomic number of 12?
  • Carbon.
  • Calcium.
  • Magnesium.
  • Manganese.
the atomic number gives the number of

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.
in this atom there are

15

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