Symbols Br3579 and B79r can be written,
whereas symbols Br7935 and B35r are not acceptable because 
1. The general convention for representing an element along with its atomic number (A) and atomic mass (Z) is XZA
2. The general convention for representing an element along with its atomic mass (A) and atomic number (Z) is XZA

3. The general convention for representing an element along with its wavelength (A) and frequency (Z) is XZA
4. The general convention for representing an element along with its isotopes (A) and atomic number (Z) is XZA

Subtopic:  Introduction of Atomic Structure |
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The atomic number of elements whose outermost electronic configuration are represented by 3s1 and 2p5 respectively, is: 

1. 9, 7

2. 9, 11

3. 11, 5 

4. 11, 9

Subtopic:  Introduction of Atomic Structure |
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A certain particle carries 2.5 × 10–16 C of static electric charge. The number of electrons present in it would be

1. 1460 

2. 1350 

3. 1560 

4. 1660 

Subtopic:  Introduction of Atomic Structure |
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If the diameter of a carbon atom is 0.15 nm, the number of carbon atoms that can be placed side by side in a straight line across the length of the scale of length 20 cm long will be:

1. 1.33 × 1072. 5.46 × 1083. 1.33 × 1094. 2.36 × 108

Subtopic:  Introduction of Atomic Structure |
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The diameter of a zinc atom is 2.6 Å. If zinc atoms are arranged side by side lengthwise, number of atoms present in a length of 1.6 cm would be:
1.  5.153 x 107
2.  6.153 x 107
3.  4.153 x 109
4.  6.153 x 103

Subtopic:  Introduction of Atomic Structure |
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2 ×108 atoms of carbon are arranged side by side. The radius of a carbon atom if the length of this arrangement is 2.4 cm would be 

1. 7.0 x 10-11 m

2. 5.0 x 10-11 m

3. 8.0 x 10-11 m

4. 6.0 x 10-11 m

Subtopic:  Introduction of Atomic Structure |
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Yellow light emitted from a sodium lamp has a wavelength (λ) of 580 nm.

The frequency (ν) and wave number of this yellow light would be, respectively,

1. 517 x 1014 s-1 , 172 x 106 m-1

2. 6.17 x 1014 s-1 , 1.72 x 106 m-1

3. 4.17 x 1014 s-1 , 2.72 x 106 m-1

4. 5.17 x 1014 s-1 , 1.72 x 106 m-1

Subtopic:  Introduction of Atomic Structure |
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The wave number of a light whose time period is 2.0 × 10–10 s would be

1. 16.66 m-1

2. 1. 66 m-1

3. 32.34 m-1

4. 12.34 m-1

Subtopic:  Introduction of Atomic Structure |
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In Rutherford's experiment, generally, the thin foil of heavy atoms like gold, platinum, etc. have been used to be bombarded by the α-particles. If the thin foil of light atoms like aluminum etc. is used in Rutherford’s experiment, the difference that would be observed from the above results is :

1. The same results will be observed

2. More deflection would be observed

3. There will not be enough deflection

4. None of the above

Subtopic:  Introduction of Atomic Structure |
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The incorrect statement regarding the characteristics of X-rays is :

1. The radiation can ionize the gas

2. It causes a fluorescence effect on ZnS

3. It is deflected by electric and magnetic fields

4. Have a shorter wavelength than ultraviolet rays

Subtopic:  Introduction of Atomic Structure |
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