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Announcements

Groups with Names

Periodic Table

Where are we going from here?

Element Structures

Element Structures- Allotropes

Element Structures- Sulfur Allotropes

Where are we going from here?

Covalent Compounds

Atoms of different elements held together by covalent bonds Molecular covalent- individual molecules

Network covalent- large network of atoms

Graphene resting on a silicon dioxide substrate layer

Molecular Covalent Compounds

nonmetal + nonmetal = molecular compound C + O : CO, CO2

S + H : H2S

C + H : CH4

Types of Formulas

GLUCOSE

ACETIC ACID

Examples

Naming Molecular Compounds

Binary compounds- 2 different elementsName first element, using full nameName second element, adding –ideUse prefixes to indicate # of atoms

Only use prefix for first name if >1 atom Always use prefix for second element

Examples CO N2O

BF3

# Prefix

1 mono-

2 di-

3 tri-

4 tetra-

5 penta-

6 hexa-

7 hepta-

8 octa-

9 nona-

10 deca-

Exception:

Some materials have common

names (e.g. H2O=water,

NH3=ammonia)

Where are we going from here?