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100
Positively charged particle in an atom.
What is a proton?
100
Electrons farthest from the nucleus.
What are valence electrons?
100
They don't react very easily with other atoms.
What are the noble gases?
100
Atom or group of atoms that have become electrically charged.
What is an ion?
100
When two atoms share electrons.
What is a covalent bond?
200
A particle in an atom that has no electric charge.
What is a neutron?
200
Elements in the same column, up and down.
What is a group or family?
200
They have seven outside electrons.
What are the halogens?
200
Attraction between two oppositely charged particles.
What is an ionic bond?
200
When two pairs of electrons are shared between atoms.
What is a double bond?
300
Negatively charged particle in an atom.
What is an electron?
300
A system used for organizing elements into categories based on how they react.
What is the periodic table?
300
Very reactive elements that want to lose one electron.
What are the alkali metals?
300
Charged groups of atoms that react as one.
What is a polyatomic ion?
300
When sharing of electrons creates one atom slightly negative and the other atom slightly positive.
What is a polar bond?
400
The tiny, central core of an atom.
What is the nucleus?
400
A horizontal row of elements.
What is a period?
400
Have two particles farthest from the center.
What are the alkaline earth metals?
400
An orderly, three-dimensional arrangement of atoms.
What is a crystal?
400
When electrons are shared equally.
What is a nonpolar bond?
500
Number of protons in an atom.
What is the atomic number?
500
Visual display showing the number of particles farthes from the center of an atom.
What is an electron dot diagram?
500
Groups who are named after their top element.
What are boron, carbon, nitrogen and oxygen?
500
Three characteristic properties of ionic compounds.
What are crystal shape, high melting points, and electrical conductivity?
500
Materials that consists of molecules which have atoms that share electrons.
What are molecular compounds?
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