Structure of Atom Test

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Structure of Atom Test - 18

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Weekly Quiz Competition

Question 1
1 / -0

Atomic number of calcium is ?

A
18

B
19

C
20

D
21

Solution

The number o protons found in the nucleus of an atom of a given element is called atomic number. Elements are placed in periodic table according to their atomic number.
Example:-
(1) Atomic number of Calcium is $$20$$
$$^{40}_{20}Ca$$
(2) Atomic number of Magnesium is $$12$$
$$^{24}_{12}Mg$$
Question 2
1 / -0

Which of the following has the same number of protons?

A
Isobars

B
Isoelectronic

C
Isotopes

D
Isotones

Solution

Isotopes are elements having the same atomic number but different mass numbers. e.g : $$_1H^1,\ _1H^2,\ _1H^3$$ are isotopes of hydrogen.
Question 3
1 / -0

Element having atomic number 33 belongs to this group?

A
III

B
IV

C
V

D
VI

Solution

Electronic configuration of element with atomic number 33 is $$1s^22s^22p^63s^23p^64s^23d^{10}4p^3$$. So, it is a p-block element with 3 electrons in p orbital, therefore it lies in 5 A group or 15 group.
Question 4
1 / -0

The relation between atomic number (Z) and atomic mass (A) for light elements is given by :

A
$$A=Z$$

B
$$A=2Z$$

C
$$2A=Z$$

D
$$A=4Z$$

Solution

Atomic number (Z) is total no of proton present in nucleus and atomic mass (A) is total no of proton and neutron present in nucleus.
For light atoms till atomic number 20, generally atomic mass is twice the atomic number
$$A=2Z$$ as $$n=p$$
Question 5
1 / -0

Atomic number of platinum is?

A
68

B
78

C
74

D
64

Solution

Atomic number of Platinum is 78.
Question 6
1 / -0

Who is regarded as father of modern chemistry ?

A
Ruterford

B
Einstien

C
Lavoisier

D
C.V Raman

Solution

Antoine Lavoisier (1743-1794). He was a French chemist who made important contributions to the science.He is considered the father of modern chemistry. He recognized and named oxygen and isolated the major components of air. Antoine-Laurent de Lavoisier is known as "the father of modern chemistry."
Question 7
1 / -0

The electronic configuration of $$He$$ is $$2$$ and that of oxygen is:

A
$$2,4$$

B
$$2,5$$

C
$$2,6$$

D
$$2,6,1$$

Solution

Electronic configuration of He is $$1s^2$$
Therefore corresponding oxygen can be written as,
[He] $$2s^22p^4$$
i.e $$1s^22s^22p^4$$
i.e $$2,6$$
Question 8
1 / -0

Which of the following is not true for atomic number?

A
It indicates the number of protons in the nucleus

B
It is represented usually by Z

C
It is identical with the mass number

D
It is constant for a given element

Solution

Atomic number is different from mass number. Rest of the options are correct.
Question 9
1 / -0

The ratio of energy to frequency of a radiation emitted by an electron is equal to :

A
wave length

B
velocity of electron

C
bohr's radius

D
planck's constant

Solution

The ratio of energy to frequency of a radiation emitted by an electron is equal to Planck's constant.
Question 10
1 / -0

Who suggested the distribution of electrons into different orbits of an atom?

A
E. Goldstein

B
Ernest Rutherford

C
Bohr and Bury

D
Dalton

Solution

The arrangement and distribution of electrons in different orbits were given by Bohr and Bury. The arrangement of electrons in different shells and sub-shells is known as the electronic configuration of a particular element.

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Re-Attempt Weekly Quiz Competition

Structure of Atom Test - 18

Result

Structure of Atom Test - 18

Score

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Rank

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SHARING IS CARING

Question 1

18

19

20

21

Solution

Question 2

Isobars

Isoelectronic

Isotopes

Isotones

Solution

Question 3

III

IV

V

VI

Solution

Question 4

$$A=Z$$

$$A=2Z$$

$$2A=Z$$

$$A=4Z$$

Solution

Question 5

68

78

74

64

Solution

Question 6

Ruterford

Einstien

Lavoisier

C.V Raman

Solution

Question 7

$$2,4$$

$$2,5$$

$$2,6$$

$$2,6,1$$

Solution

Question 8

It indicates the number of protons in the nucleus

It is represented usually by Z

It is identical with the mass number

It is constant for a given element

Solution

Question 9

wave length

velocity of electron

bohr's radius

planck's constant

Solution

Question 10

E. Goldstein

Ernest Rutherford

Bohr and Bury

Dalton

Solution

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