Module 1 Flashcards
represents the number of protons in the nucleus of an atom
Atomic number
the total number of protons and neutrons in nucleus
Mass number
can be determined by subtracting the atomic number of an element from its mass number
number of neutrons
The number and arrangement of _______ in the energy level of an atom determines what type of compounds the element will form
electrons
This means that there is always an equal number of positive and negative charges in an atom.
All atoms are neutral
Represents the number of protons in an atom in which is also the number of electrons since there is an equal number of protons and electrons in every atom
Atomic number
Arrangement of electrons of the elements in the free state
Electron configuration
Also called as “building-up principle”
shows how energy increases in subshells
Aufbau principle
states that no two electrons in the same atom can be in the same configuration at the same time
Pauli exclusion principle
states that all orbitals of a given sublevel must be occupied by a single electron before pairing begins
Hund’s rule
consist of the symbol for an element together with dots representing the number of electrons in the outermost level
Electron-Dot Symbol
Electron-Dot Symbols also called as
Lewis Structure
represented as vertical columns labeled with Roman numerals
Groups
represented as horizontal rows of elements indicated by Arabic numerals
period
the last energy level
period number
the number of elections on the last energy level
group number
