Classification Of Elements And Periodicity In Properties

Question 1

The most electropositive element in periodic table is

Answer 1

Caesium

Question 2

Caesium is widely used in photoelectric cells due to

Answer 2

High electropositivity

Question 3

The most dense element in the periodic table

Answer 3

Iridium

Question 4

Best conductor of electricity is

Answer 4

Silver

Question 5

The maximum number of isotopes are shown by the element

Answer 5

Tin ( sn ).

Question 6

Which element has the highest ionisation enthalpy

Answer 6

Helium

Question 7

Which element is the lightest element in the periodic table

Answer 7

Hydrogen

Question 8

Which element has the highest melting point among metals

Answer 8

Tungsten

Question 9

The highest melting point among the elements in the periodic table is

Answer 9

Diamond

Question 10

Which all have positive electron gain enthalpy

Answer 10

Nitrogen, beryllium and noble gases

Question 11

Among lanthanides which is radioactive

Answer 11

Promethium ( Z=61 )

Question 12

Atomic number of inert gas in the 7 th period is

Answer 12

118

Question 13

Acidic character increases as go from left to right in a

Answer 13

Period

Question 14

The similarity between a pair of elements in different groups and different periods and located diagonally in the periodic table is known as

Answer 14

Diagonal relationship

Question 15

Amphoteric elements are also known as

Answer 15

Neutral elements

Question 16

The group of elements in which the last electron is present in the anti penultimate shell of atom

Answer 16

F block elements

Question 17

The effective nuclear charge across the period

Answer 17

Increases

Question 18

Example of diagonal relationship

Answer 18

Li—> Mg
Be—>Al
B—>Si

Question 19

When we move down the group

Answer 19

The atomic and ionic radius increases

Question 20

Metallic character __________ and non metallic character __________ down the group

Answer 20

Increase and decreases respectively

Question 21

Equation of formal charge is

Answer 21

= total no of valence electrons - no of lone pairs- no of shared pairs

Question 22

Examples of super octet molecules

Answer 22

PCl ,SF ,IF

5 6 7

Question 23

Life saving drug used in cancer

Answer 23

Cisplatin and taxol

Question 24

Ionic bonds exists between

Answer 24

Metals and non metals