Atomic structure and subatomic particles
Learn about the basic structure of atoms, Dalton's atomic theory, atomic number, mass number, and the roles of protons, neutrons, and electrons.
Why this shows up in the exam
NEET and JEE often test your understanding of atomic basics and how to identify elements and isotopes.
How NEET tests this
Practise it
These are real questions from past NEET papers that test this exact idea.
Select the correct statements from the following: A. Atoms of all elements are composed of two fundamental particles. B. The mass of electron is 9.10939 × 10⁻³¹ kg. C. All the isotopes of a given element show same chemical properties. D. Protons and electrons are collectively known as nucleons. E. Dalton's atomic theory, regarded the atom as an ultimate particle of matter. Choose the correct answer from the options given below:
Push further
More challenging4 harder questions built from the past papers above — a step up in difficulty, with distractors designed so you can't get there by elimination. Written and checked by our reviewers, not from a real paper.
Consider the following statements regarding atomic theory: 1. Atoms are indivisible and indestructible according to Dalton's original atomic theory. 2. The charge of an electron is -1.602 × 10⁻¹⁹ C. 3. All atoms of different elements have the same number of protons. 4. The atomic number of an element is determined by the total number of protons and neutrons. 5. Isotopes of an element exhibit identical chemical reactivity.
More from Structure of Atom
Aufbau, Hund's, Pauli principles and orbital filling
Learn the rules for filling electrons in orbitals, including the Aufbau principle, Hund's rule, Pauli exclusion principle, and exceptions in configurations.
Atomic spectra and photon energy
Explore the hydrogen spectrum, spectral series, photon energy calculations, Rydberg formula, and the relationship between wavelength, frequency, and energy.
Quantum numbers and orbitals
Master the four quantum numbers, their rules, permissible values, and how they specify orbitals and electron arrangements.
Orbital shapes, orientations, and nodes
Study the shapes and orientations of s, p, and d orbitals, the concept of nodes, and how quantum numbers relate to these features.
Isoelectronic species and electronic configuration
Understand isoelectronic species, how to determine electronic configurations for atoms and ions, and the use of noble gas core notation.
Wave-particle duality and de Broglie wavelength
Understand the concept of wave-particle duality and how to calculate the de Broglie wavelength for particles.