Unit 3 Lesson 3 Flashcards

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1
Q

Chemical bond

A

An interaction that holds atoms or ions together

An atom forms bonds by gaining, losing, or sharing valence electrons

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2
Q

Molecule

A

A group of atoms held together by chemical bonds

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3
Q

What happens to atoms during a chemical change?

A

Atoms are not created or destroyed. They are just rearranged

When atoms are rearranged, chemical bonds are formed or broken

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4
Q

Models of atoms

A

Electron cloud model - shows how electrons are in the electron cloud but doesn’t show the # of electrons

Bohr model - shows the # of electrons as dots in rings around the nucleus. Each ring represents an energy level

Space-filling model - atoms are shown as solid spheres

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5
Q

Bohr model

A

Shows electrons in rings called energy level

Each energy level can hold a specific # of electrons
1st level - can hold up to 2
2nd level - can hold up to 8

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6
Q

Valence electrons

A

Electrons found in the outermost energy level of an atom

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7
Q

How does the period table show the # of valence electrons?

A

Elements in the same group have the same # of valence electrons

In groups 1 and 2 the group # is the same as the # of valence electrons
In groups 13-18, the # of valence electrons is the same as the last digit

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8
Q

Why do atoms form bonds?

A

An atom forms bonds if its outermost energy level is not full of electrons

Forming bonds allows atoms to fill the outermost energy level

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