Periodic trends Shown by 3rd Period Elements

Question 1

Explain metallic character

Answer 1

Intial elements are metals, but P, S, Cl, Ar are non metals.

Bonding type of 3rd period elements vary as below

Na – M
Mg – M
Al – M
Si – NC
P – C
S – C
Cl – C

Question 2

Explain the metallic bond type of 3rd period elements

Answer 2

Bonding type of 3rd period elements vary as below

Na – M
Mg – M
Al – M
Si – NC
P – C
S – C
Cl – C

Question 3

Na bond type

Answer 3

M

Question 4

Mg bond type

Answer 4

M

Question 5

Al bond type

Answer 5

M

Question 6

Si bond type

Answer 6

NC

Question 7

P4 bond type

Answer 7

C

Question 8

S8 bond type

Answer 8

C

Question 9

Cl2 bond type

Answer 9

C

Question 10

Write all 3rd period oxides

Answer 10

Na2O
MgO
Al2O3
SiO2
P2O5 (P4O10)
SO3
Cl2O7

Question 11

Write bond types of 3rd period oxides

Answer 11

Na2O - I
MgO - I
Al2O3 - I
SiO2 - NC
P2O5 (P4O10) - C
SO3 - C
Cl2O7 - C

Question 12

Write the nature of 3rd period oxides

Answer 12

Na2O - strongly basic
MgO - basic
Al2O3 - amphoteric
SiO2 - very weakly acidic
P2O5 (P4O10) - weakly acidic
SO3 - acidic
Cl2O7 - strongly acidic

Question 13

nature of Na2O

Answer 13

strongly basic

Question 14

nature of MgO

Answer 14

basic

Question 15

Al2O3 Nature

Answer 15

Amphoteric

Question 16

Nature of SiO2

Answer 16

very weakly acidic

Question 17

P2O5

Answer 17

weakly acidic

Question 18

SO3

Answer 18

acidic

Question 19

Cl2O7

Answer 19

Strongly acidic

Question 20

Bond type of Na2O

Answer 20

Ionic

Question 21

Bond type of MgO

Answer 21

Ionic

Question 22

Bond type of Al2O3

Answer 22

Ionic

Question 23

Bond type of SiO2

Answer 23

Network covalent

Question 24

Bond type of P2O5

Answer 24

Covalent

Question 25

Bond type of SO3

Answer 25

C

Question 26

Bond type of Cl2O7

Answer 26

C

Question 27

Explain variation of acidic character along 3rd period

Answer 27

O is the more electronegative element.

Electronegativity of 3rd period oxides increase across period

Initial oxides are hence ionic but ionic character gradually decreases and covalent character increases across the period

Ionic oxides are basic and covalent oxides are acidic. So basic chracter gradually decreases and acidic character increases across period