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  • Electrons are involved in two types of bonds that can exist in compounds. There is a property that can be used to predict the type of bond that will form during a reaction. This property is called electronegativity. it is the ability of an element to attract electrons when atom is in a compound.
  • What is the electrinegativity?
  • In general, electronegativity values decrease from top to bottom within a group. For representative elements, the values tend to increase from left to right across a period.
  • What is the trend of electronegativity?
  • Increase
  • Recall that atomic size tends increase from top to bottom, and nuclear charge increase, so atoms have less energy to attract electrons and they have less electronegativity.
  • Why it tends decrease from top to bottom within a group?
  • Recall that nuclear charge tends increase, atoms may have more energy to attract electrons, so that they have more electronegativity.
  • Why it tends increase from left to right across a period?
  • Decrease
  • Wow!!! That's so coooool!!!
  • The noble gases are omitted because they are not form many compounds. They have the full electrons in the shells, so it's hard for them to lose or gain electrons.
  • Why there are few elements are not trend with that rule?
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