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Periodic Table

Author: Callum Ingram-Knepper
Across
The number of protons in the nucleus of an atom
The properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
An atom or a group of atoms that has lost or gained one or more electrons and therefore has a net of electrical charge
An electron in the outermost energy level of an atom
A negatively charged subatomic particle found in the energy level of an atom
A neutral subatomic particle in the nucleus of an atom
Any atom having the same number of protons but a different number of neutrons
The center of an atom made up of protons and neutrons
An ion with a negative charge
A positively charged subatomic in the nucleus of an atom
Down
The smallest particle that has the properties of an element
A quantity equal to one- twelfth the mass of a carbon 12 atom
Symbol for atomic mass unit
Any of the possible energies an electron may have in an atom
A horizontal row of elements in the periodic table
The process of adding electrons to or removing electrons from an atom or group of atoms
The total number of protons and neutrons in the nucleus of an atom
A region in an atom where there is a high probability of finding electrons
An ion with a positive charge
A vertical column of elements in the periodic table