9th Standard Syllabus & Materials
9th Standard
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Published on: 09/09/2019
Periodic classification of elements
Download Tamil Nadu 9th Standard Science question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Science Test1.
State modern periodic law.
2.
What are the limitations of Mendeleev's periodic table?
3.
What are groups and periods in the modern periodic table?
4.
State any five features of modern periodic table.
5.
If the electronic configuration of an element is 1s2 2s2 2p6 3s2 3p1, then it will occupy___________ block of the periodic table.
s
p
d
f
6.
The increasing order of the energy of subshells is
s>p>d>f
s
p
p
7.
Elements in the modern periodic table are arranged in__________ groups and __________ periods.
7,18
18,7
17,8
8, 17
8.
Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their__________
atomic numbers
atomic masses
similarities
anomalies
9.
If Dobereiner is related with 'law of triads', then Newlands is related with __________.
Modern periodic law
Hund's rule
Law of octaves
Pauli's Exclusion principle
10.
Example for liquid metal is___________
11.
B, Si, Ge and As are the examples of___________
12.
The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was____________
13.
Noble gases belong to________ group of the periodic table
14.
In Dobereiner's triads, the atomic weight of the middle element is the _______of the atomic masses of 1st and 3rd elements.
15.
Modern Periodic Law
16.
Alkaline earth metal
17.
Law of octaves
18.
Alkali metal
19.
Triads
20.
Metals can gain electrons
21.
Newland's periodic table is based on atomic masses of elements and modern periodic table is based on atomic number of elements.
1.
Modern periodic law states that "The Chemical and Physical properties of elements are the periodic functions of their atomic number".
2.
(i) Elements with large difference in properties were included in the same group.
Eg: Hard metals like copper (Cu) and silver (Ag) were included along with soft metals like sodium (Na) and potassium (K).
(ii) No proper position could be given to the element hydrogen. Non-metallic hydrogen was placed along with metals like lithium (Li), sodium (Na) and potassium (K).
(iii) The increasing order of atomic mass was not strictly followed throughout.
Eg: Co & Ni, Te & I.
(iv) No place for isotopes in the periodic table.
3.
In modern periodic table the horizontal rows are called periods. There are seven periods in the periodic table. Vertical columns starting from top to bottom are called groups. There are Eighteen groups in the periodic table.
4.
Features of modern periodic table:
(i) All the elements are arranged in the increasing order of their atomic number.
(ii) The horizontal rows are called periods. There are seven periods in the periodic table.
(iii) The elements are placed in periods based on the number of shells in their atoms.
(iv) Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the periodic table.
(v) Based on the physical and chemical properties of elements, they are grouped into various families.
5.
(b)
p
6.
(b)
s
7.
(b)
18,7
8.
(a)
atomic numbers
9.
(c)
Law of octaves
10.
( )
mercury
11.
( )
metalloids
12.
( )
atomic mass
13.
( )
18th
14.
( )
average
15.
Henry Moseley
16.
Calcium
17.
Newlands
18.
Sodium
19.
Dobereiner
20.
(b)
21.
(a)
9th Standard Syllabus & Materials
9th Standard
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NEW9th Standard
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NEW9th Standard
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Tamilnadu Stateboard 9th Standard Subjects
Tamilnadu Stateboard Standards
