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Q2W2CHEM

CHANGES IN MATTER

QuestionAnswer
Element A simple chemical substance made up of atoms that all have the same number of protons.
Group Vertical column on the periodic table.
Ion An atom that has lost or gained one or more electrons
Ionization energy The energy with which an atom holds on to its electrons.
Isotope Atoms of the same element that have different numbers of neutrons in their nuclei.
Law of fixed proportions Elements only come together in specific ratios to make compounds. Glucose (C6H12O6) demonstrates the law of fixed proportions because it always forms with 12 atoms of hydrogen for every 6 atoms of carbon and oxygen.
Molecule Smallest unit of a compound.
Neutron Subatomic particle with no charge.
Period Horizontal row on the periodic table.
Proton Subatomic particle with a positive charge.
Valence electrons The electrons in an atom’s highest energy level.
Created by: Ruth.Miller
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