Free Printable Period 3

1.

Across the Period 3 , the elements are

a)

Na Mg Al C S P Cl Ar

b)

Na Mg Al Si P S Cl Ar

c)

Li Be C N O He

d)

Li Be Si S P Cl Ar

2.

Going across the Period 3 of the Periodic Table from Sodium to Chlorine ,

a)

The number of filled electronic shell increases

b)

The atomic mass increases

c)

Electrical conductivity increase

d)

The electrode potential become more negative

3.

Which oxide of an element dissolves in water to form acidic solution

a)

Sodium

b)

Magnesium

c)

Silicon

d)

Phosphorus

4.

Across the period 3 , atomic radii of elements decrease due to

a)

proton number increase

b)

screening effect increase

c)

nucleus attraction increase

d)

the number of shell filled with electron increase

5.

Sulphur has higher melting point than phosphorus . It is due to

a)

Van der Waals forces is stronger

b)

size is smaller

c)

Sulphur exit as S₈

d)

higher charge density

6.

Which pair is correct ?

a)

Magnesium Simple Molecular Structure

b)

Silicon Metallic Bonding

c)

Phosphorus Giant Covalent Structure

d)

Argon Monoatom

7.

Silicon has highest melting point. Which statement is incorrect about its melting point.

a)

Silicon is a metalloid

b)

The structure is held by a strong covalent bond

c)

Silicon need more energy to break the strong covalent bond

d)

Silicon has a giant covalent structure

8.

Which statement is incorrect explain the metallic structure?

a)

Number of electrons which each atom can contribute to the delocalised "sea of electrons" increases

b)

The "sea of electrons" is getting progressively nearer to the nuclei and so more strongly attracted.

c)

Greater screening effect due to an extra shell of electrons.

d)

Number of electrons which each atom can contribute to the delocalised "sea of electrons" increases

9.

∆H vapor of an element is the enthalpy heat change when 1 mol of an element is converted from liquid to vapour as its boiling point.

Which element has the highest ∆H in Period 3 ?

a)

Na

b)

Mg

c)

Si

d)

P

10.

Which element in Period 3 has the highest electrical conductivity ?

a)

Na

b)

Mg

c)

Al

d)

Si

11.

Oxide compound will produce when period 3 elements react with oxygen . Which reaction does not occur?

a)

2Mg + O₂ → 2MgO

b)

4Al + 3O₂ → 2Al₂O₃

c)

Si + O₂ → SiO₂

d)

4Cl₂ + O₂ → 2Cl₂O

12.

Which element in Period 3 does not react with water?

a)

Aluminium

b)

Silicon

c)

Phosporus

d)

Sulphur

13.

Which element in Period 3 has the strongest oxidizing agent ?

a)

Natrium

b)

SIlicon

c)

Sulphur

d)

Chlorine

14.

Which oxide of Period 3 elements shows both acidic and basic properties?

a)

MgO

b)

Al₂O₃

c)

SiO₂

d)

ClO₂

15.

Which oxide form acidic solution but does not dissolve in water?

a)

Al₂O₃

b)

SiO₂

c)

P₄O₆

d)

ClO₂

Period 3

Total questions: 15

Worksheet time: 8mins

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