Chemistry - Periodic Table - Grade 9

groups and important things you need to know about the Periodic Table

How to do determine the number of valence electrons?

look at the group

How to determine the number of energy levels?

look at the period

What are the properties of Alkali metals?

• highly reactive - especially with water

• always found combined in nature

What are the properties of Transition metals?

• widely used in the industry

• have many different properties

• very colourful

• variable icons charge due to the e^- configuration

What are the properties of Halogens?

• most reactive non metal

• show trends in colour and phase at stp(Standard room temperature and pressure)

• only group with solid liquid and gas

What are the properties of Noble Gasses?

• non reactive

• non metals

What are the two only elements that naturally occur as a liquid?

Bromine(Br) and Mercury(Hg)

What are the metalloids

Boron(B), Silicon(Si), Germanium(Ge), Arsen(As), Antimony(Sb), Tellurium(Te), Astatine(At)

• all along the ‘staircase’

• “Bogus Stuff! Girls are superheroes, too! Alright?”

• not “Alright Polakos”

What are the diatomic elements

• 7 up

Hydrogen(H), Nitrogen(N), Oxygen(O), Fluorine(F), Chlorine(Cl), Bromine(Br), Iodine(I)