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The Periodic Table

Across
Material that can be hammered or rolled into flat sheets and other shapes.
The emission of radiation by unstable atomic nucleus.
The ability of an object to transfer heat or electricity to another object.
A class of elements classified by their properties like conductivity.
The elements in group 3.
The Russian scientist that published the first periodic table.
An element block is a set of elements located in adjacent element groups.
A property of an element when it combines with another a reaction occurs.
Material that can be pulled out or drawn into a wire.
Atoms with the same number protons and a different number of neutrons.
In a regular pattern.
Down
One or two letters that identify an element.
The atomic nuclei of unstable isotopes release fast-moving particles and energy.
Elements that lack the properties of a metal.
The number of protons in an atom's nucleus.
The sum of the protons and neutrons in the nucleus of an atom.
The average mass of all the isotopes in an element.
The vertical rows of the periodic table that consists of elements with similar properties.
The horizontal rows on the periodic table.
A subtance which cannot be broken down into any simpler substance by chemical means.