7th Grade Contract Crossword

a table filled with elements
Devised first periodic table based on atomic mass
Arranged elements by atomic number and is what we use today
Vertical columns of elements with similar properties, numbered 1-18
Horizontal row of elements that contain increasing numbers of protons & electrons
Uses the element symbol and dots to represent outer energy level
Good conductors of heat & electricity
The most reactive of all metals; don't occur in nature in their element form
Shiny, ductile, and malleable; combine readily with other elements
Most familiar metals because they often occur in nature uncombined
Composed mostly of protons and neutrons in the nucleus; also known as mass number
The number of protons in an atom; also identifies the element.
type of matter with a fixed composition that CANNOT be separated by physical means
substance made up of atoms with the same identity
atoms of two or more elements combined