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Q2W1CHEM

HISTORY OF ATOMIC THEORY

QuestionAnswer
Alchemy A fake science in which scientists tried to turn cheap metals into gold.
Atomic Theory All matter is made of tiny particles called atoms. Different types of matter are made of different types of atoms. Atoms are not created or destroyed.
Continuous Continuing in space without any interruption. A beach appears continuous, but is actually made of millions of individual pieces of sand.
Anion A negatively-charge ion, formed when an atom gains one or more electrons. Nonmetals usually form anions because they like to gain electrons.
Atom Tiny particles that make up all matter. Atoms are made of subatomic particles.
Atomic number The number of protons in an atom’s nucleus. The periodic table is arranged in order of increasing atomic number.
Atomic radius The atomic radius describes the distance of the farther electron from the center of the nucleus.
Cation A positively-charged ion, formed when an atom loses one or more electrons. Metals usually form cations because they don’t have many electrons in their valence shells.
Chemical bonds The links that hold the atoms of any compound together. Chemical bonds contain chemical energy, which can be released if the bonds are broken.
Compound A substance made of atoms of more than one type of element that are bonded together.
Electron Subatomic particle that has a negative charge. Electrons are found in electron (energy) shells around the nucleus of the atom.
Electronegativity Ability of an atom to attract electrons toward itself. More electronegative atoms try to “steal” electrons from other elements.
Created by: Ruth.Miller
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