Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na⁺,K⁺,Mg²⁺,Ca²⁺,S^2-,Ar

3

(a)

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A)
(i) Z = 17, A = 35.
(ii) Z = 92, A = 233.
(iii) Z = 4, A = 9.

3

(a)

Write the complete symbol for the atom with the given atomic number (Z) and atomic mass (A)
(i) Z = 17, A = 35
(ii) Z= 92, A = 233
(iii) Z = 4, A = 9.

3

(a)

From the following sets of quantum numbers, state which are possible. Explain why the others are not possible.

3

(a)

The uncertainty in the position of a moving bullet of mass 10 g is 10^-5 m. Calculate the uncertainty in its velocity?

3

(a)

The uncertainty in the position and velocity of a particle are 10^-10 m and 5.27 x 10^-24 ms^-1respectively. Calculate the mass of the particle.

3

(a)

Calculate the de Broglie wavelength of an electron moving with 1% of the speed of light?

3

(a)

The kinetic energy of an electron is 4.55 x 10^-25 J. The mass of electron 9.1 x 10^-1 kg. Calculate velocity, momentum and the wavelength of the electron?

3

(a)

In a hydrogen atom, the energy of an electron in first Bohr's orbit is 13.12 x 10⁵ mol^-1 . What is the energy required for its excitation to Bohr's second orbit?

3

(a)

What are the two longest wavelength lines (in manometers) in the Lyman series of hydrogen spectrum?

3

(a)