Chemical Bonding Flashcards
Forces between molecules , weaker than between atoms
Intermolecular forces
Atoms in molecules are held together by chemical bonds which are also called
Intramolecular bonds
How many valence electrons can hydrogen and helium have ?
2
How many valence electrons can lithium have?
2
How many valence electrons can beryllium have ?
4
How many valence electrons can boron have ?
6
Beyond the _ row, elements can expand their Octets to more than 8 electrons
2nd
Form crystal lattices, have high melting and boiling points, conduct electricity except in solid state
Ionic compounds
Low melting points, do not conduct electricity , weak intermolecular forces
Covalent compounds
The number of shared electron pairs between two atoms
Bond order
As bond length increases, bond energy ?
Decreases
Increase in number of shared electrons caused a ____ in bond length
Decrease
The energy required to separate two bonded atoms. This increases as the number of shared electrons increases.
Bond energy
Formal negative charge should go on the most _______ atom
Electronegative
A dipole moment is measured in vector quantity u measured in ____ units
Debye (coulomb-meters)
Dipole moment equation
U= q(product of charge magnitude) x r(distance between two partial charges)
In this type of bond the shared electron pair come from the lone pair of one of the atoms in the molecule
Coordinate covalent bond
Compound that can accept an electron pair to form a covalent bond
Lewis acid
Compound that can donate an electron pair to form a covalent bond
Lewis base
Structure that has 4 electron pairs and no nonbonding pairs
Tetrahedral(109.5)
4 electron pairs , 1 non bonding pairs
Trigonal pyramid
4 electron pairs , 2 non bonding pairs
Bent (104.5)
5 electron pairs no non bonding pairs
Trigonal bipyramidal (90,120,180)
6 electron pairs , no non bonding pairs
Octahedral (90,180)
