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 ${}_{\mathrm{Z}}{}^{\mathrm{A}}\mathrm{X}$

The correct arrangement of the following electromagnetic spectrum in the increasing order of frequency is:

The work function of the Cesium atom is \(1.9~\mathrm{eV}.\) What is the threshold frequency of radiation for this atom?

1. 32.22 × 10^–16 J

2. 12.22 × 10^–16 J

3. 22.27 × 10^–16 J

4. 31.22 × 10^–16 J
 

If the position of the electron were measured with an accuracy of +0.002 nm, the uncertainty in the momentum of the electron would be: 

1. 5.637 × 10^–23 kg m s^–1

2. 4.637 × 10^–23 kg m s^–1

3. 2.637 × 10^–23 kg m s^–1

4. 3.637 × 10^–23 kg m s^–1

The unpaired electrons in Al and Si are present in the 3p orbital. The electrons that will experience a more effective nuclear charge from the nucleus are :

1. Electrons in the 3p orbital of silicon

2. Electrons in the 5d orbital of aluminium

3. Electrons in the 3p orbital of aluminium

4. Electrons in the 5p orbital of silicon

Identify the element with the highest number of unpaired electrons in its ground state from the given options :

The number of electrons that can be present in the subshells having m_s value of \(-\frac{1}{2}\) for n = 4 are:

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