If Dobereiner is related with 'law of triads', then Newlands is related with __________.

(a)

Modern periodic law

(b)

Hund's rule

(c)

Law of octaves

(d)

Pauli's Exclusion principle

Modern periodic law states that the physical and chemical properties of elements are the periodic functions of their__________

(a)

atomic numbers

(b)

atomic masses

(c)

similarities

(d)

anomalies

Elements in the modern periodic table are arranged in__________ groups and __________ periods.

(a)

7,18

(b)

18,7

(c)

17,8

(d)

8, 17

The increasing order of the energy of subshells is

(a)

s>p>d>f

(b)

s

(c)

p

(d)

p

If the electronic configuration of an element is 1s² 2s² 2p⁶ 3s² 3p¹, then it will occupy___________ block of the periodic table.

(a)

s

(b)

p

(c)

d

(d)

f

In Dobereiner's triads, the atomic weight of the middle element is the _______of the atomic masses of 1st and 3rd elements.

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average

Noble gases belong to________ group of the periodic table

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18th

The basis of the classifications proposed by Dobereiner, Newlands and Mendeleev was____________

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atomic mass

B, Si, Ge and As are the examples of___________

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metalloids

Example for liquid metal is___________

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mercury

Newland's periodic table is based on atomic masses of elements and modern periodic table is based on atomic number of elements.

(a) True

(b) False

Metals can gain electrons

(a) True

(b) False

Triads

(1)

Newlands

Alkali metal

(2)

Sodium

Law of octaves

(3)

Calcium

Alkaline earth metal

(4)

Henry Moseley

Modern Periodic Law

(5)

Dobereiner

State modern periodic law.

What are groups and periods in the modern periodic table?

What are the limitations of Mendeleev's periodic table?

State any five features of modern periodic table.