Journey Inside the Atom Mind Map

Historical atomic models are the step-by-step scientific ideas proposed to explain the structure of an atom.

Write the models in order and mention one clear improvement made by each model.

Subatomic particles are the smaller particles inside an atom: electrons, protons, and neutrons.

Remember charge, location, and relative mass together for each particle.

Atomic notation writes an element symbol with mass number and atomic number to show its nuclear composition clearly.

Read the lower number first for protons, then subtract it from the upper number for neutrons.

Atomic number is the number of protons present in the nucleus of an atom.

If the question asks identity of an element, look at proton number or atomic number.

Mass number is the total number of protons and neutrons present in the nucleus of an atom.

For school-level calculation, count only protons and neutrons for mass number.

Electron distribution in shells means arranging electrons in fixed shells around the nucleus according to their maximum capacity and filling order.

For the first 20 elements, fill K first, then L, then M using 2, 8, 8 as the practical pattern.

Valency is the combining capacity of an atom, usually decided by the number of electrons lost, gained, or shared to complete the outermost shell.

If valence electrons are more than 4, subtract from 8 to find valency for basic examples.

Isotopes are atoms of the same element with the same atomic number but different mass numbers. Isobars are atoms of different elements with the same mass number but different atomic numbers.

For isotopes, check same Z. For isobars, check same A.