4th Monthly Test
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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they lose electrons
Cation
they gain electrons
Anion
charged atom
Ion
Metals are always positive
True
Non metals are always negative
True
Atoms of the same elements that have the same atomic number but a different mass number
Isotopes
Atoms with the same number of protons but different numbers of neutrons
Isotopes
It is equivalent to protons
Atomic number
It is the combined number of protons, electrons, and neutrons present in its nucleus
Mass number
Positive charge of an element
Protons
Negative charge of an element
Electrons
Neutral charge on an element
Neutrons
Region of atom where electrons may be found
Electron cloud
Pictorial representation of the electrons in an atom.
Orbital Diagram
No two electrons can have the exactly the same set of quantum numbers
Pauli Exclusion Principle
States that a lower energy orbital should be filled first before the next higher energy level.
Aufbau Principle
States that every orbital of the same energy must be occupied with one electron before any orbital is doubly occupied
Hund’s Rule
Represented by whole numbers
Principal quantum numbers (N)
values that are used when describing the energy levels of electrons in atoms
Quantum Numbers
Represented by sublevel in each energy level
Angular Quantum numbers (L)
s (max of e-)
2
p (max of e-)
6
d (max of e-)
10
f (max of e-)
14