Clarification Of Elements & Periodicity In Properties

Question 1

Principle quantum number(n)

Answer 1

Main energy level known as shell

Question 2

Subshells also called

Answer 2

Orbitals(s p d f)

Question 3

3d orbitals series called

Answer 3

Transition series

Question 4

5th period series

Answer 4

4d transition series

Question 5

6th period series

Answer 5

4f inner transition series/lanthanoid series

Question 6

S block elements

Answer 6

Low ionization enthalpy
Alkali lose 1 e
Alkaline lose 2 e’s
Metallic char increase down the group
All are ionic except lithium & beryllium

Question 7

P block

Answer 7

ns² np¹-⁶
High -ve ‘e’ gain enthalpy
Accept 1 or 2 e’s to be stable
No metallic char increases from L to R

Question 8

D block elements

Answer 8

Group 3 to 12
(n-1)d¹-¹⁰ ns⁰-²
All metals
Form colored ions
Variable oxidation states
Paramagnetic
Used as catalysts

Question 9

F block elements

Answer 9

(n-2)f¹-¹⁴(n-1)d⁰-¹ ns²
All metals
Antacids are radioactive

Question 10

Trnds in physical properties of elements

Answer 10

Atomic radius
Ionic radius
Ionization enthalpy
Electron gain enthalpy
Electronegativity

Question 11

Trends in chemical properties

Answer 11

1. Oxidation states
2. Anomalous properties of 2nd period elements

Question 12

What is oxidation state of an element?

Answer 12

Charge acquired by its atom based in electro -ve consideration of other atoms in the molecule

Question 13

Properties of 2nd group elements

Answer 13

Form Ionic compounds
Small size
Large charge
High e’ -vity
9 valence orbitals

Question 14

Electron gain enthalpy increases

Answer 14

Across period

Question 15

Ionization enthalpy of extreme left in a period is

Answer 15

Least

Question 16

E’ gain enthalpy of rightmost element is

Answer 16

Highest -ve

Question 17

What are amphoteric oxides?

Answer 17

They behave as acids with bases and bases with acids