s3 chemistry ( 元素週期表 ). aim ! group similar elements together. easy to find an element in...

S3 Chemistry

(元素週期表 )

Aim !

• Group similar elements together.• Easy to find an element in the table.

How would you group the elements together ?

• By their states ?????

• Three groups (solids, liquids, gases)

By their Chemical Properties(特性 )

1. Metals react with water.

-sodium

-potassium

-iron

• Sodium reacts vigorous(劇烈 ) with water.

• Potassium reacts vigorous with water.

• Iron reacts slowly with water.

• Therefore, sodium and potassium put into same group(group I).

• Iron puts into another group.

By their Chemical Properties(特性 )

2.Metals with hydrochloric acid

-Calcium

-Magnesium

-Copper

• Calcium reacts ___________ with hydrochloric acid.

• Magnesium reacts ____________ with hydrochloric acid.

• Copper has no reaction with hydrochloric acid.

• Therefore, calcium and magnesium put into same group(group II).

• Copper puts into another group.

Action of aqueous sulphite solution on aqueous chlorine solution, aqueous bromine, aqueous iodine solution and sulph

ur.

• Aqueous (水溶 )

Results:

• Chlorine solution, bromine solution and iodine solution turn colourless.

• Sulphur has no reaction.

• Therefore, chlorine, bromine and iodine put into same group(group VII).

• Sulphur puts into another group

Periodic Table

Group I Group II Group VI Group 0

Li (2,1) Be (2,2) O (2,6) He (2)

Na (2,8,1) Mg (2,8,2) S (2,8,6) Ne (2,8)

K (2,8,8,1) Ca (2,8,8,2) Se (2,8,18,6) Ar (2,8,8)

Periodic Table

• Number of outermost shell electrons in an atom

Periodic Table

• Family names / group names• Alkali metals

• Alkaline earth metals

• Halogens

• Noble gases

Periodic Table

Period 2 Li (2,1) Be (2,2) B (2,3) C (2,4 )

N (2,5) O (2,6) F (2,7) Ne (2,8)

Periodic Table

• Number of electron shells in an atom

• Occupied (佔有 )

Exercise

The atomic number of an element X is 16.

To which group and period does element X

belong ?

A. Group I and Period 3

B. Group III and Period 6

C. Group VI and Period 3

D. Group 0 and Period 2

Congratulations !

You get the right answer.

Oh ! Try again !

Reference

www.periodictable.com

End