Atomic Structure and isotopes Flashcards

1
Q

What charge do atoms have?

A

Neutral

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2
Q

what is the structure of an atom?

A

-Most= empty space between the nucleus and the electron shells

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3
Q

What are the properties of the nucleus?

A

Compared with a total, volume of the atom, nucleus is tiny and extremely dense

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4
Q

What are electrons held in place by?

A

an Electrostatic attraction from the nucleus

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5
Q

what are nucleides?

A

A term used to describe any atom of which the atomic number and the mass number are specified

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6
Q

What is the mass (nucleon number) defined as?

A

The number of protons and neutrons are present in the nucleus of the atom

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7
Q

what is the atomic number (proton number) defined as?

A

The number of protons present in the nucleus of the atom

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8
Q

how do you find the number of electrons in a negative ion (anion)?

A

add the charge to the atomic number

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9
Q

how do you find the number of electrons in a positive ion (cation)?.

A

Subtract the charge from the atomic number?

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10
Q

what does isoelectronic mean?

A

Atoms and ions that have the same number of electrons

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11
Q

What are isotopes?

A

Atoms of the same element with different numbers of neutrons and different masses

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12
Q

why do isotopes have similar chemical properties?

A

Because they have the same electronic structure

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13
Q

why my isotopes have slightly varying physical properties?

A

Because they have different masses

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14
Q

what is relative atomic mass?

A

The weighted mass of all the isotopes- taking into account the relative abundance of isotopes

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15
Q

What is the relative atomic mass equation?

A

isotopic mass x % abundance/ 100
isotopic mass x Relative abundance/ total relative abundance.

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16
Q

when do use the second relative atomic mass equation?

A

if the relative abundance is used instead of percentage abundance

17
Q

what is relative atomic mass of an element?

A

The weighted mean mass of an atom of an element, compared with 1/12th mass of an atom of carbon 12, which has a mass of 12

18
Q

What is the relative isotopic mass for an isotope?

A

The mass of an isotope of, compared with 1/12th mass of an atom of carbon 12, which has a mass of 12

19
Q

what is relative molecular mass?

A

avg mass of molecule, compared with 1/12th mass of an atom of carbon 12, which has a mass of 12