PS M18 L1 Stability in Bonding Notes Review

A __ is a substance formed from two or more elements in which the exact combination and proportion of elements is always the same.

Elements can combine chemically to form _______________________

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A chemical formula shows what elements a compound contains and the exact number of __ of each element in a unit of that compound.

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An atom is chemically stable when its _______________________ energy level is complete.

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Electron dot diagrams contain the chemical symbol for an element surrounded by dots representing the ____________________ electrons—the electrons in the outer energy level.

Atoms with unstable outer energy levels can lose, gain, or share electrons to obtain a ____________________ outer energy level.

In a water molecule, hydrogen contributes one electron and oxygen the other in each hydrogen-oxygen bond. The oxygen atom needs 2 additional electrons to be stable, so it shares with ______ hydrogen atoms.

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When atoms gain, lose, or share electrons, an ____________________ forms between the atoms, pulling them together to form a compound. This attraction is called a chemical bond.

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What shows the elements a compound contains and the exact number of atoms of each element in a unit of that compound?

• a chemical formula

• a compound formula

• an electron-dot diagram

• a chemical bond

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Sucrose, also known as table sugar, has the chemical formula C₁₂H₂₂O₁₁. How many hydrogen atoms are in one unit of sucrose?

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