Symbols ${}_{35}{}^{79}\mathrm{Br}$ and ${}^{79}Br$ can be written,
whereas symbols ${}_{79}{}^{35}\mathrm{Br}$ and ${}^{35}Br$ are not acceptable because
1. The general convention for representing an element along with its atomic number (A) and atomic mass (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$
2. The general convention for representing an element along with its atomic mass (A) and atomic number (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$

3. The general convention for representing an element along with its wavelength (A) and frequency (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$
4. The general convention for representing an element along with its isotopes (A) and atomic number (Z) is ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$

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:

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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