C4a atomic structure

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what is the radius and the mass of an atom ?
radius - 1x10^-10 and the mass of an atom is 1x10^-23 grams
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what is the atomic number of an atom mean ?
the number of protons in an atom
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why are all atoms nuetral ?
protons and electrons charges cancel each other
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what is the mass number of an atoms mean ?
the total number of protons and nuetrons together
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what is an isotope ?
an atom with the same number of protons but different number of nuetrons
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how are elements arranged in the periodic table ?
they'e in groups starting from to 1-8 and periods starting from 1-8
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what does the group number tell you about an atom ?
the amount of electrons in the outer shell
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what does the period number tell you about an atom ?
amount of shells in the atom
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describe how electrons are arranged in a shell
2 electrons in first shell and maximum of 8 in the rest
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what is an ion ?
an ion with a positive/negative charge
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how are positive and negative electrons formed ?
when an atom loses or gains electrons to become positive or negative
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why is Dalton, J.J Thomson, Rutherford and Bohr important in the development of the theory of atomic structure ?
Dalton model was an individual atom. J.J Thomson discovered the electron. Rutherford discovered the nucleus
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describe how unexpected results from Geiger and Marsdens experiment led to the theory of a nuclear atom ?
the unexpected results uncovered a nucleus with the atom
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Other cards in this set

Card 2

Front

what is the atomic number of an atom mean ?

Back

the number of protons in an atom

Card 3

Front

why are all atoms nuetral ?

Back

Preview of the front of card 3

Card 4

Front

what is the mass number of an atoms mean ?

Back

Preview of the front of card 4

Card 5

Front

what is an isotope ?

Back

Preview of the front of card 5
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