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Elements and the Periodic Table

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Points: 21

Horizontales
Move rapidly around the nucleus and have a negative electric charge.
A chart showing all the elements arranged according to the repeating pattern of their properties.
Atoms with the same number of protons and different number of neutrons.
A neutral group of two or more atoms held together by covalent bonds.
Includes the symbol for the element surrounded by dots that represent the valence electrons.
A diagram, mental picture, mathematical statement, or an object that helps explain ideas about the natural world.
A substance that contains one kind of atom and cannot be broken down into a simpler form.
At the center is a tiny, dense nucleus containing protons and neutrons. Surrounding the nucleus is a cloudlike region of moving electrons.
The electrons that have the highest energy and are in the outermost shell.
Verticales
Suggested that atoms had negatively charged electrons set in a positive sphere.
Very small center core of an atom that contains protons and neutrons.
Two or more substances that are together in the same place but their atoms are NOT chemically bonded.
Substance that forms when atoms from two or more elements bond together.
The number of protons in an atom's nucleus.
Electrons move rapidly in different directions around the nucleus.
An atom was mostly open space.
Suggested that electrons move in specific orbits around the nucleus of an atom.
The sum of the protons and neutrons in the nucleus of an atom.
Have a positive electric charge.
Smallest particle that can still be considered an element.
Have no charge or a neutral charge.