Periodicity And Chemical Classification

Question 1

Modern periodic law.

Answer 1

The properties of elements are periodic properties of their atomic numbers.

Question 2

Number of groups in modern periodic table.

Answer 2

18 groups.

Question 3

Number of periods in the modern periodic table.

Answer 3

7 periods.

Question 4

Alkaline Earth Metals.

Answer 4

Be Mg Ca Sr Ba Ra

Question 5

Boron Family

Answer 5

B Al Ga In Tl

Question 6

Carbon Family

Answer 6

C Si Ge Sn Pb

Question 7

Nitrogen Family

Answer 7

N P As Sb Bi

Question 8

Oxygen Family

Answer 8

O S Se TE Po

Question 9

Halogen Family

Answer 9

F Cl Br I At

Question 10

Noble gas family

Answer 10

He Ne Ar Kr Xe Rn

Question 11

What are p block elements ?

Answer 11

Last electron gets filled in p-orbital. Excluding He , number of p block elements are 30. Gallium and Bromine are liquids.

Question 12

What are d block or transition elements ?

Answer 12

Last electron gets filled in d orbital. All elements of d block are metals. Except Mercury. There are 33 d block elements but there are only 30 transition elements.

Question 13

What are f block elements ?

Answer 13

Last electron gets filled in f orbital.

Question 14

Value of shielding effect of electrons of 1s orbital.

Answer 14

0.30

Question 15

Shielding effect of each electrons of ns and np. ( electrons of the outermost orbital )

Answer 15

0.35

Question 16

Shielding effect of each electron s , p or d orbitals of the penultimate shell (n-1)?

Answer 16

0.85

Question 17

Van der waals radius.

Answer 17

Half the distance between the nuclei of two non binder atoms belonging to two different molecules closest to one another.

Question 18

What are the atomic radii of inert gases measured in ?

Answer 18

The value of atomic radii in noble gases are always ditermined as van der waal radius.

Question 19

Exception regarding second ionisation potential of Be and B and Mg and Al.

Answer 19

The second I.P of Be is greater than B, and the third I.P of Mg is greater than Al due to high stability of fully filled orbitals.

Question 20

Exception regarding second I.P of N and O and third I.P of P and S.

Answer 20

In second I.P of N is greater than O and third I.P of P is greater than S due to stability of half filled orbitals.

Question 21

Exception regarding I.P of increasing order of second period elements.

Answer 21

Li<b></b>

Question 22

Exception regarding I.P of third period elements.

Answer 22

Na

Question 23

Element in the periodic table having highest I.P

Answer 23

He

Question 24

Order of second I.P of C N O and F.

Answer 24

C

Question 25

Exception regrading electron affinity of C and N.

Answer 25

On going from C to N in second period , the value of EA decreased instead of increasing.

Question 26

Exception regarding value of EA of Si and P.

Answer 26

In the third period , value of EA of Si is greater than P. This is because outermost orbit of P is half filled, is relatively more stable.

Question 27

Value of EA of noble gases

Answer 27

0

Question 28

Exception regarding EA of F and Cl

Answer 28

The value of electron affinity of F is lower than that of Cl. Ea of Cl is highest in periodic table.

Question 29

Difference in electronegativity between two elements for being basic, acidic or amphoteric?

Answer 29

For difference is 2.3 or more, oxide is basic. If value is lower than 2.3 then first amphoteric then acidic in nature.

Question 30

Difference between the electronegativity of two elements regarding their bonding type.

Answer 30

For difference of electronegativity is more than 1.7, then ionic bond is formed , if less than 1.7 then covalent bond is formed.

Question 31

Liquid non metal.

Answer 31

Br

Question 32

Liquid metal.

Answer 32

Hg, Ga, Cs and Fr

Question 33

Solid volatile non metal.

Answer 33

Iodine.

Question 34

Lightest metal.

Answer 34

Li

Question 35

Heaviest metal

Answer 35

Ir

Question 36

Most abundant element in earth

Answer 36

Al

Question 37

Element with lowest electronegativity.

Answer 37

Cs

Question 38

Highest electronegativity

Answer 38

F

Question 39

Element with highest Ionisation potential

Answer 39

He

Question 40

Element with lowest ionisation potential

Answer 40

Cs

Question 41

Element with highest electron affinity

Answer 41

Cl

Question 42

Elements which are bridge metals

Answer 42

Na and Mg

Question 43

Lightest element

Answer 43

H

Question 44

Periodicity of oxidising nature.

Answer 44

Oxidising nature increases across the period and decreased down the group.

Question 45

Periodicity or reducing nature.

Answer 45

Reducing nature decreases along the period and increases down the group.

Question 46

Periodicity of effective nuclear charge.

Answer 46

Increases across the period and remains constant down the group.