Chemical bonds Flashcards

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1
Q

what are trace elements

A

elements only in minute quantities

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2
Q

how do you find the mass number of an element

A

Number of protons+neutrons

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3
Q

how to find the atomic number

A

number of protons

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4
Q

how to find number of neutrons

A

mass number-atomic number

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5
Q

what are Isotopes

A

the same element that has a different number of neutrons

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6
Q

how many electrons can hold in each electron shell

A

first : 2, second: 8, third: 8

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7
Q

what is an ionic bond

A

one atom donates or gains one or more electrons. ions have opposite charges.

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8
Q

what is a Covalent bonds

A

two atoms share pair of electrons.

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9
Q

what is a molecule

A

two or more atoms held together by a covalent bond

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10
Q

how to identify Electronegativity

A

left of chart = smaller, right of chart = larger

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11
Q

what are polar bonds

A

atom is bonded to a more electronegative atom

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12
Q

hydrogen bond

A

exists between an electronegative molecule and a hydrogen molecule bonded to another electronegative molecule.

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