Test Your Knowledge of the Periodic Table Crossword

the electrons found in the outermost shell of an atom
elements in the same group have similar
columns that have similar properties to include reactivity
_____ are horizontal rows that have the same number of energy levels or energy shells
share characteristics of both metals and nonmetals
mainly found on the left side of the periodic table
cannot be broken down into a simpler substance and have the same chemical properties
seven chemical elements that make up Group 18
elements which form negative ions by accepting or gaining electrons
very reactive, electropositive, monovalent metals forming strongly alkaline hydroxides.
the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
the total number of protons and neutrons in a nucleus.
subatomic particle in the nuclei, with a positive electric charge
a subatomic particle with no charge
a subatomic particle with a negative charge
nonmetallic elements that form strongly acidic compounds with hydrogen from which simple salts can be made.
two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons
a negatively charged ion
a positively charged ion
where the protons and neutrons of an atom are located