Trends In The Periodic Table Flashcards
How is the periodic table arranged
In order of increasing atomic mass
What is the covalent radius
Half atom size))
How does covalent radius vary as we go:
- across
- down
Decreases
Increases
Define first ionisation energy for an element
The amount of energy required to remove a mole of electrons from 1 mole of atoms in gaseous state.
( remeber state symbols)
Why is 3rd ionisation energy of magnesium so much higher than its 2nd
Removal of a full outer shell
Metallic bonding describe briefly
Positive atom cores surrounded by delocalised electrons
What type of bonding is noble gases
Monatomic
Name the van der waals force that exist between group 0 (halogens)
London dispersion forces
What is meant my temporary dipoles
Dipoles that constantly change due to random fluctuations of electrons
What causes temporary dipoles to forms
Random fluctuations of electrons within molecules cause an imbalance in charges
What happens to London dispersion forces and number of electrons increase
The strength increases
Describe BRiefly covalent bonding
A shared pair of electrons between two atoms
Define allotrope
Two different physical forms of the same element
Type of bonding of a fullerene
An allotrope of carbon which is a discrete covalent molecular
Define electronegativity
Measure of an atoms attraction for its bonding electrons
