The Periodic Table

• Elements are arranged in the periodic table according to their

  atomic number
• The vertical columns on the periodic table are called

  groups
• the horizontal rows are called

  periods or series
• Most of the elements in the periodic table are

  solids
• what elements are liquids

  Mercury and Bromine
• the imaginary steps divides the

  metals and non metals
• Metals are good conductors of _________ and _________.

  heat and electricity
• Metals are


  malleable and ductile
• metal oxides are


  alkaline
• non metal oxides are

  acidic
• what gases are unreactive

  noble gases
• when did mendeleev form his own table

  1869
• Why was mendeleevs table accepted?

  he could correctly predict unknown elements
• Why do elements in the same group have similar properties?

  they have the same number of electrons in their outermost shell
• why do elements react

  they want to become stable by achieving a noble gas electron configuration (full shell)
• Why are noble gases unreactive?

  They have a full outer shell
• What is the Law of Triads? What scientist is responsible for this law?

  johann dobereiner created the law of triads in 1817. he grouped metals of similar reactivity in groups of three.
• what else did dobereiner suggest?

  average atomic mass of 1 and 3 = 2's atomic mass
• What is the law of octaves?

  a law created by Newlands that showed that certain elements had repeating properties, every 8th element had similar properties to the 1st one.
• why was newlands theory not accepted

  he thought all elements had been discovered, he was a chemist and it stopped working after calcium.
• What are group 1 elements called?

  alkali metals
• what are group 2 elements called?

  alkali earth metals
• what are group 7 called?

  Halogens
• what are group 8 called?

  noble gases