Unit 4: ionic bonding Flashcards Preview

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Flashcards in Unit 4: ionic bonding Deck (12):
1

cation

a positively charged ion

2

anion

a negatively charged ion

3

swap and drop

a shortcut for determining the ionic compound's formula: Al+3 and O-2 make Al2O3

4

exceptions to swap and drop

sometimes the ratio can be reduced. Ca+2 and O-2 don't make Ca2O2; they make CaO

1:1 is a simper ratio than 2:2

5

transition metals

because of the d orbitals, transition metals can have more than one charge.

You need to use a Roman numeral in the name to signify the charge.

Ex: iron III oxide

6

naming ionic compounds

cation name stays the same

anion gets "-ide"

transition metals get a Roman numeral

Ex: mercury II sulfide

7

polyatomic ion

a group of atoms covalently bonded together which together carry a charge.

8

electronegativity difference

Two atoms must have an electronegativity difference of 2 or higher to be considered an ionic compound.

9

periodic chart trend

ionic compounds are always a metal and a nonmetal

the elements come from opposite sides of the periodic chart

10

An alkali earth metal and a halogen will form an ionic compound.  What will be the ratio of the elements?

1:2

Ex: CaF2

11

Elements from group 1 and group 6 form an ionic compound. What will be the ratio of the elements?

2:1

Ex: Na2S

12

properties of ionic compounds

crystaline, brittle, high melting point, soluble in water

Good conductors of electricity when dissolved in water