✓✗The region in space where the probability of finding an electron is maximum is called

✓✗Select the correct statements from the following:
A. Atoms of all elements are composed of two fundamental particles.
B. The mass of an electron is 9.10939 × 10⁻³¹ kg.
C. All the isotopes of a given element show the same chemical properties.
D. Protons and electrons are collectively known as nucleons.
E. Dalton's atomic theory regarded the atom as the ultimate particle of matter.
Choose the correct answer from the options given below:

✓✗Given below are two statements:
Statement I: The Balmer spectral line for the H atom with the lowest energy is located at \( \dfrac{5}{36}R_H \) cm⁻¹ (R_H = Rydberg constant).
Statement II: When the temperature of a black body increases, the maximum of the curve (intensity versus wavelength) shifts to a shorter wavelength.
In the light of the above statements, choose the correct answer from the options given below.

✓✗The electronic configuration of chromium (Z = 24) is

✓✗The de Broglie wavelength of an electron moving with a velocity of 1 × 10⁶ m s⁻¹ is about (h = 6.626 × 10⁻³⁴ J s, m_e = 9.1 × 10⁻³¹ kg)

✓✗The ratio of the shortest wavelength of the Lyman series to the shortest wavelength of the Balmer series of hydrogen is

✓✗In Bohr's model, the ratio of kinetic energy to total energy of an electron is

✓✗The total number of electrons in an atom that can have n + l = 5 is

✓✗The value of Planck's constant is 6.63 × 10⁻³⁴ J s. The velocity of light is 3.0 × 10⁸ m s⁻¹. Which value is closest to the wavelength in nanometres of a quantum of light with frequency 8 × 10¹⁵ s⁻¹?

✓✗Consider the following sets of quantum numbers:

	n	l	m	s
(i)	3	0	0	+1/2
(ii)	2	2	1	+1/2
(iii)	4	3	−2	−1/2
(iv)	1	0	−1	−1/2
(v)	3	2	3	+1/2

Which of the following sets of quantum numbers are NOT possible?

✓✗The photoelectric effect supports the

✓✗Hund's rule states that pairing of electrons in orbitals of the same subshell

✓✗For a 1s orbital, the plot of the probability density ψ² against the distance r from the nucleus

✓✗The number of photons of light of wavelength 500 nm that together carry 1 J of energy is about (h = 6.626 × 10⁻³⁴ J s, c = 3 × 10⁸ m s⁻¹)

✓✗The number of d-electrons in Fe²⁺ (Z = 26) is NOT equal to the number of electrons in which one of the following?