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Atomic Vocabulary

Across
A basic unit of a chemical element
The positively charged central core of an atom
A vertical column in the periodic table
Diagrams that show the bonding between atoms of a molecule and the lone pairs of electrons
The number of protons in the nucleus which determines chemical properties
The region of negative charge surrounding a atomic nucleus
Two or more forms of the same element that contain different number of neutrons in their nuclei
Down
Total number of protons and neutrons in a nucleus
Table of chemical elements arranged by atomic number
The average mass of the element
A particle in an atom with a positive charge equal to the electrons negative charge
Horizontal row in the periodic table
A negatively charged particle in an element
any of a number of subatomic particles carrying a fractional electric charge, postulated as building blocks of the hadrons
A particle in an atom with no charge