Atomic Structure & Periodicity
4 terms
Neutron
Atomic Structure & Periodicity
u
An electrically neutral subatomic particle found in the nucleus, with a mass slightly greater than that of a proton.
m_n = 1.6749 × 10⁻²⁷ kg
Noble Gases
Atomic Structure & Periodicity
Dimensionless
The group 18 elements, whose completely filled valence shells make them exceptionally unreactive.
ns² np⁶ (He is 1s²)
Node
Atomic Structure & Periodicity
Dimensionless
A region within an orbital where the probability of finding an electron falls to zero.
total nodes = n − 1
Nucleus
Atomic Structure & Periodicity
m
The dense, positively charged core of an atom, containing virtually all of its mass in protons and neutrons.
r ≈ 1.2 × A^(1/3) fm