Chapter 7 (Ionic Compounds) Flashcards
What’s an ionic bond?
When oppositely charged particles (ions) attract.
What’s an ionic compound?
The byproduct after two ions bond.
What’s a chemical formula?
A written out version of the compound based on the elements that were bonded.
What’s the duet rule?
For elements with electrons in strictly the first principal energy level only two electrons are needed for a stable valence shell.
What’s the octet rule?
Elements with electron in at least the second principal energy level need eight electrons to satisfy their valence shells.
What is a coordination number?
The # of atoms surrounding a central ion in a unit cell of the crystal lattice.
What’s a unit cell?
The most basic part of the crystal lattice (the part that repeats within the structure.)
What is a crystalline structure or crystal lattice?
When ionic bonding occurs those elements together form a crystalline structure called the crystal lattice.
What’s an LDS?
A visualization of the valence electrons in dot format to help understand both the duet and octet rules.
What’s a formula unit?
The ratio of positive & negative particles within the crystal lattice.
What’s lattice energy?
A release of energy is associated with the fact that ionic compounds are more stable than the individual ions that form them.
- Can be measured.
What’s a metallic bond?
When positively charged metal ions and delocalized electrons connect (bond) to each other.
What’s an alloy?
A mixture of bonded metals.
What are delocalized electrons?
Free, delocalized, and mobile atoms that move around the “sea of electrons” to exhibit metallic bonding.
What’s an interstitial alloy?
Different metals occupy interstitial spaces (holes) in the lattice structure.
