📍ATOMIC STRUCTURE

Explanation: The principle quantum number (n) is associated with the energy level of the electron in an atom, determining the electron's distance from the nucleus.

Explanation: Electrons, particularly those in the outermost shell (valence electrons), are responsible for the chemical properties and reactivity of an atom.

Explanation: The maximum number of electrons that can occupy the second energy level (shell) of an atom is 8, according to the 2n^2 rule.

Explanation: The maximum number of electrons that can occupy the second energy level (shell) of an atom is 8, according to the 2n^2 rule.

• Explanation: The Bohr model proposed that electrons orbit the nucleus in specific energy levels or shells, with fixed energies.

Explanation: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses.

Explanation: Neutrons are subatomic particles with no electric charge, and they are found in the nucleus of the atom.

Explanation: The atomic number of an element is the number of protons in the nucleus of an atom, which uniquely identifies the element.

Explanation: J.J. Thomson is credited with the discovery of the electron through his experiments with cathode rays.

Explanation: Electrons are subatomic particles with a negative charge, and they orbit the nucleus of the atom.

Explanation: The nucleus is the central part of an atom, containing protons and neutrons, and it is where most of the atom's mass is concentrated.