Periodic Table Crossword

A substance that cannot be broken down into a simpler substance.
The smallest unit of an element that has all of the properties of the element.
The number of protons and neutrons in the nucleus of one atom of the element.
The number of protons contained in each nucleus of its atoms of the element.
A horizontal row on the periodic table.
A vertical column on the periodic table.
An atom that has gained or lost one or more electrons.
An element or substance that conducts heat and electricity, is malleable, ductile, and has low ionization energy.
An element or substance that does not conduct electricity or heat, is usually a gas at room temperature, is brittle, and has high ionization energy.
An element that has some properties of a metal and some properties of a nonmetal.
A subatomic particle with a negative charge and a negligible mass relative to protons and neutrons.
The central part of an atom that contains protons and neutrons and has most of the mass of an atom.
A subatomic particle with a positive charge and a relative mass of 1 and a relative charge of +1.
An uncharged subatomic particle with a mass of 1 relative to a proton and a relative charge of 0.
Atoms of an element with the same number of protons and electrons a but different number of neutrons.
An electron in the outermost energy level of an atom.
A physical property of a material that can be hammered or rolled into flat sheets or other shapes.
A physical property of a material that can be pulled out into a long wire.
A physical property of a material that can transfer heat or electricity.
The ease and speed with which an element combines or reacts with other elements to form a new substance.