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Atoms, Elements, and the Periodic Table 9th

Across
Smallest particle of an element that retains the element's properties
Different molecular structures of the same element
Subatomic particle with a negative charge
Element that in which the nucleus breaks down and gives of energy
Subatomic particle with a neutral charge
Molecule that consists of two atoms of the same element
Elements that are shiny, malleable, ductile, and good electrical conductors
Elements that are stable because their outermost energy levels are full
Subatomic particle with a positive charge
Down
Vertical columns on the periodic table
Elements with some properties of metals and some of nonmetals
Elements that are poor conductors and usually gases or solids at room temperature
Elements in groups 3 through 12
Small, positively charged center of an atom
Horizontal rows on the periodic table
Atoms of the same element with a different number of neutrons
Element with 7 electrons in its outer energy level