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Chemistry 9 icse > THE PERIODIC TABLE > Flashcards

THE PERIODIC TABLE Flashcards

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1
Q

Total number of elements discovered so far

A

118

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2
Q

The scientist who arranged the elements in increasing order of ATOMIC NUMBER

A

HENRY MOSELEY

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3
Q

What is a TRIAD?

A

Group of three elements

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4
Q

Which type of elements are shown at the bottom of the PT?

A

Inner transition elements OR Lanthanides and Actinides series

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5
Q

Find the odd one out.

Dobereiner’s triad, Newland’s law of octaves, Mendeleev’s PT, Modern PT

A

Modern PT

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6
Q

A, B, C are the elements of a Dobereiner’s triad. If the atomic mass of A is 40 and that of C is 137, what should be the atomic mass of B?

A

88.5

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7
Q

Lithium, Sodium and Potassium elements were put in one group on the basis of their similar properties. What are those similar properties?

A

All are metals, Each has valency 1, Each has an oxide that is alkaline in nature

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8
Q

According to Newland’s law of octaves, there is resemblance in properties of FIRST element with _______ element when they are arranged in increasing order of atomic mass.

A

EIGHTH

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9
Q

What are periodic properties?

A

Properties which repeat themselves at regular intervals

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10
Q

Define Mendeleev’s periodic law

A

Physical and chemical properties of elements are periodic functions of their ATOMIC MASS

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11
Q

Name eka-boron

A

Scandium

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12
Q

Name eka- aluminium

A

Gallium

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13
Q

Name eka-silicon

A

Germanium

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14
Q

Explain the defect ANOMALOUS PAIRS OF ELEMENTS in Mendeleev’s PT. Give an example.

A

Certain pairs of elements having higher atomic masses have been given positions before the elements having lower atomic masses.
Example: Co and Ni, Te and I

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15
Q

How can we overcome the defect ANOMALOUS PAIRS OF ELEMENTS in Mendeleev’s PT?

A

If we arrange elements according to their ATOMIC NUMBER

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16
Q

In Mendeleev’s PT the isotopes should be arranged in different positions. Why?

A

Because in Mendeleev’s PT, the elements are arranged in the increasing order of their atomic masses. Since isotopes have different atomic masses they should be arranged in different positions

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17
Q

Reason for periodicity in properties of elements.

A

Recurrenceof similar electronic configuration

18
Q

Define modern periodic law

A

Physical and chemical properties of elements are periodic functions of their ATOMIC NUMBERS

19
Q

Give 3 examples of periodic properties

A

Atomic radius, Ionisation potential, Electron affinity

20
Q

Define atomic radius

A

distance between the centre of the nucleus and the outermost shell

21
Q

Horizontal rows in Modern PT

A

Periods

22
Q

Number of periods in MPT

A

7

23
Q

Vertical columns in MPT

A

Groups

24
Q

Number of Groups in MPT

A

18

25
Q

The shortest period

A

period 1

26
Q

Alkali metals belong to which Group?

A

Group 1 (or 1A)

27
Q

Group 17 elements are called as

A

Halogens

28
Q

A metalloid in period 2 and period 3

A

Period 2-Boron

Period 3- Silicon

29
Q

Lanthanides and Actinides have similar properties because they belong to same group, mention the group number

A

Group 3 or 3B

30
Q

Elements of group number from 3 to 12 are known as

A

Transition elements

31
Q

Which Group elements are called Main group elements / representative elements / normal elements

A

Elements of Group 1,2,13,14,15,16,17

32
Q

The number of shells present in atom gives us its

A

Period number

33
Q

Group 1 elements are called Alkali metals. Why?

A

because they react vigorously with water and produce hydrogen and alkali solution

34
Q

As we go down the group, the number of shells

A

increases arithmetically

35
Q

As we go down the group, the number of valence electrons

A

remains same

36
Q

Iodine e.c is 2,8,18,18,7. Give the location of Iodine in MPT

A

Period 5 and group 17 (or 7A)

37
Q

As we go down the group, the ATOMIC SIZE

A

increases

38
Q

As we go down the group, the metallic character

A

increases

39
Q

As we go down the group, the metallic character

A

increases

40
Q

The degree of reactivity _______ as we move from fluorine to iodine

A

decreases

41
Q

Valency of group VA elements is

A

3

Chemistry 9 icse (7 decks)

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