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APT Vocabulary

Across
The model of an atom that shows the number of protons and neutrons in the nucleus and the arrangement of electrons in the electron cloud of an atom.
The number of protons in an atom of an element.
Electrons that are located in the outermost energy level that determine an element's chemical properties.
The center of the atom where protons & neutrons are located and therefore, has a positive charge.
Horizontal rows on the table that contain elements with the same number of energy levels.
The smallest particle of an element that retains the chemical properties of that element.
Down
Is equal to the number of protons and neutrons in the nucleus of an atom.
The area surrounding the nucleus containing electrons and therefore, has a negative charge.
Negatively charged subatomic particle that is located in the electron cloud.
Vertical column on the table that contain elements with the same number of valence electrons and therefore, similar physical and chemical properties.
Neutral (no charge) subatomic particle that is located in the nucleus.
Positively charged subatomic particle that is located in the nucleus.