Atomic number of an element is the number of
AProtons in the nucleus
BNeutrons inside the nucleus
CElectrons in the outer shell
DSub-shells filled in the atom
Answer & Solution
Correct answer: A. Protons in the nucleus
1. The chapter defines atomic number.
2. It equals the count of protons in the nucleus.
3. In a neutral atom it also equals the electron count.
4. So option A is correct.
_Source: Selina Concise Chemistry Class 8, Ch on Structure of Atom (Mistral OCR'd PDF), section on atomic number_
Related questions
An electron and a proton have the same kinetic energy. Which has the larger de Broglie wavHund's rule states that for degenerate orbitals of a subshell, electronsThe Aufbau principle states that electrons fill atomic orbitalsThe four quantum numbers (n, l, m_l, m_s) fully specify an electron in an atom. The magnetHeisenberg's uncertainty principle statesThe de Broglie wavelength associated with a particle of mass m and velocity v isFor a hydrogen-like ion of atomic number Z, the energy of the nth level isThe relationship E = hν (Planck) between photon energy and frequency contains constant h t