Revision of elements and compounds

04.06.2020
09:35:24
Dear students, good morning
Topic: Elements and Compounds
Pg.no : 80 to83
The important points are
1.All substance are made of small particles called atoms
2. Elements are made up of same type or one type of atom
Examples :
Gold,silver, platinum,carbon
3.Molecules are particles made up of two or more atoms joined together
Examples : Neon, Hydrozen ( H2), Oxygen ( O2), Sulphur ( S8)
4.Chemical symbol
sodium. - Na
Aluminum - Al
Calcium - Va
Iron -Fe
Silicon. - Si
Helium - He
Revise and practice well.
Watch the video for better understanding