Chemistry Chapter 2

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Last updated 9:10 AM on 9/10/26
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16 Terms

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Who proved the existence of a nucleus in an atom?

Ernest Rutherford

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Who found Electrons?

J. J. Thomson

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Who found the # of charge of the electron?

Millikan

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Who found neutrons?

James Chadwick

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Law of multiple proportions

2 elements combine in different small, whole # ratios, the compounds are different (CO and CO2)

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<p><span>What does X represent?</span></p>

What does X represent?

Element symbol

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<p>What does A represent?</p>

What does A represent?

Mass # (number)

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<p>What does Z represent?</p>

What does Z represent?

Atomic # (number)

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<p>How do you find X?</p>

How do you find X?

Protons + neutrons, then find which one it matches to on periodic table, if both ain’t there, look at atomic mass

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<p>How do you find A?</p>

How do you find A?

Protons + neutrons

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How do you find # of neutrons?

Mass # - atomic # (A - Z)

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How do find Z?

By looking at atomic # …read question carefully since sometimes if gives you the element

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What are atoms called when they don’t have a equal charge?

Ions

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What are positive ions called?

Cations

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What are negative ions called?

Anions

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How do you find the weighted, average mass?

Weighted average mass = ∑ (sum) (fractional abundance x isotopic mass)