The maximum number of electrons that can be accommodated in the M shell (n = 3) is:
Practice 2easy
An atom has 15 protons and 16 neutrons. What is its mass number?
Practice 3easy
Which of the following correctly represents the electron configuration of Iron (Fe, atomic number 26)?
Practice 4easy
The number of protons, neutrons, and electrons in ₃₇Cl⁻¹ are respectively:
Practice 5easy
According to Bohr's model, the energy of an electron in the nth orbital of a hydrogen atom is proportional to:
Practice 6medium
The maximum number of electrons that can be accommodated in the M shell (n=3) is:
Practice 7medium
Which of the following correctly represents the electron configuration of Chromium (Cr, Z=24)?
Practice 8medium
An atom has 35 electrons and 44 neutrons. The mass number of this atom is:
Practice 9medium
According to Heisenberg's Uncertainty Principle, if the uncertainty in position (Δx) of an electron is zero, then the uncertainty in momentum (Δp) would be:
Practice 10medium
The number of orbitals present in the d subshell is:
Practice 11medium
An element has the valence electron configuration 3s² 3p⁵. The number of unpaired electrons in its ground state is:
Practice 12medium
According to Bohr's model, the radius of the first Bohr orbit (a₀) is approximately:
Practice 13medium
Two atoms are isotopes of the same element. Which of the following statements is true about them?
Practice 14hard
An atom of element X has 18 electrons and 20 neutrons. What is the mass number of this atom?
Practice 15hard
According to Bohr's model, if an electron jumps from the 3rd orbit to the 1st orbit of a hydrogen atom, how many spectral lines can be emitted?
Practice 16hard
The de Broglie wavelength of an electron is 0.727 nm. If Planck's constant h = 6.63 × 10⁻³⁴ J·s and electron mass m = 9.1 × 10⁻³¹ kg, what is the velocity of the electron (approximately)?