Electronegativity & Polarity & Intro to Lewis Structure (Lesson 9) Flashcards
In regards to EN, what will make a non-polar covalent bond?
-when the electronegativity difference is 0 or very small (from 0 to 0.5)
In regards to EN, what will make polar covalent bond?
-when the electronegativity difference is intermediate (from 0.6 to 1.6)
In regards to EN, what would make an ionic bond?
-when electronegativity difference is large (from 2.0 onwards)
What happens in a non-polar covalent bond?
-electrons are shared equally between 2 atoms
What happens in a polar covalent bond?
- electrons are shared unequally between 2 atoms
- spends more time around more electronegative atom
What happens in an ionic bond?
-There is a complete transfer of electrons between 2 atoms
Which is stronger, a ionic or covalent bond?
A ionic because it takes greater energy to break ionic compound bonds than to break covalent compound bonds (bond dissociation energy)
What is a chemical bond?
-the electrical force of attraction between two atoms
What is Dipole Movement?
-the measurement of the separation of 2 oppositely charged charges
What is a bonding pair?
2 valence electrons from different atoms that overlap to form a sigma bond
What is a lone pair?
a pair of valence electron from the same atom that aren’t involved in bonding with another atom
Why do atoms bond?
-to become more electronically stable
What is the octet rule?
-the tendency for an atom to have 8 valence electrons to have the most stable electronic configuration
What are resonance structures?
-when a compound cannot be expressed by one lewis structure
What is formal charge?
The # of valence electrons that atom usually as subtracted from the # of valence electrons shown the the Lewis Structure
