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Daniel Paul
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333 - An online community of second level students & teachers.

I initially created when I was doing my leaving certificate to share my revision notes with my friends. Since then it has taken off to be a popular website among secondary school students and has been totally redesigned and rebuilt as an online community. 

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This video explains how to write good brief essays by using a few principles. Learn how to state, quote and explain to convince the reader about your point of view.
  • H – Hydrogen
  • He – Helium
  • Li – Lithium
  • Be – Beryllium
  • B – Boron
  • C – Carbon
  • N – Nitrogen
  • O – Oxygen
  • F – Fluorine
  • Ne – Neon
  • Na – Sodium
  • Mg – Magnesium
  • Al – Aluminium
  • Si... (More)

– As you move to the right across a period of elements, electronegativity increases.
– As you move down a group, electronegativity decreases.

Atomic radius:
– As you move down a group, atomic radius increases.
– As you move... (More)

Main differences between Mendeleev’s Periodic Table and the modern periodic table:

  1. In the modern periodic table, the elements are arranged in order of increasing atomic number. (In Mendeleev’s table, they were arranged in order of increasing atomic weight).
  2. More... (More)
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