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Q2W5CHEM

CHEMICAL BONDS

QuestionAnswer
Compound when two or more elements are chemically bonded; it has very different properties than the elements it's made from.
Atom smallest part of an element
Nucleus central portion of the atom; contains protons and neutrons
Electron cloud also called electron shell or energy level; where electrons are found
Valence shell the last, or outermost, electron shell Valence electrons
Noble gases do not combine with other elements to form compounds; they have full valence shells
Ionic compound formed by a transfer of electrons
Ion charged atom; when atom gives away an electron it becomes positively charged
Cation ion with positive charge; amount of charge based on how many electrons are given away
Anion ion with a negative charge; amount of charge based on how many electrons are gained.
Ionization energy increases as you move across a row in the periodic table
Proust's law states compounds always form in fixed ratios; this is because elements will always combine with other elements in a ratio that gives each element a filled valence shell.
Subscripts a small number written to the right and below an element indicating how many are present in a formula
Created by: Ruth.Miller
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