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Periodic table and Atoms

Across
An element that is shiny and conducts heat
Poor conductors of heat and electricity
Positively charged particles within the atom
An atom's central region
A distinct group of atoms held together by chemical bonds
A number that is placed in front of a chemical symbol or formula
Russian Chemist
Substances formed in a reaction
Down
What is the smallest unit of an element?
A subatomic particle that has a negative charge
Has one valence electrons
Elements that have some properties of metals and some properties non-metals
Starting materials in a chemical reaction
Vertical Columns on The periodic table
Horizontal row of elements on the periodic table