Atomic structure

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12 Terms

1

Who had the first idea of the existence of an atom and when?

john Dalton, 200 years ago

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2

What particles are atoms made of?

protons, neutrons and electrons

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3

What is within the nucleus and what orbits?

nucleus=protons and neutrons

orbit= electrons

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4

What are two properties of protons, neutrons and electrons that are especially important?

mass and electrical charge

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5

What is the number above a element?

mass number

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6

What is the number below a element?

atomic number

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7

How to count protons?

atomic Number from periodic table

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8

How to count neutrons?

mass Number minus the number of protons

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9

How to count electrons?

same as protons

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10

What is an isotope?

atoms of the same element always have the same number of protons, they may have different numbers of neutrons

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11

What are the properties of an isotope?

the isotopes of an element are identical in their chemical reactions.

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12

How small is an atom?

thickness of a crisp

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