Chemistry Test :Atomic Structure and Electron Configuration

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Flashcards for Chemistry Test: Atomic Structure and Electron Configuration

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10 Terms

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Atomic Number

The number of protons in an elemen. Also, in a neutral atom, the number of protons equals the number of electrons.

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Mass Number

It can be used to determine the number of neutrons by subtracting the number of protons from the mass number.

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Electron Configuration Sequence (up to 4p)

1s² 2s² 2p^6 3s² 3p^6 4s² 3d^10 4p^6

<p>1s² 2s² 2p^6 3s² 3p^6 4s² 3d^10 4p^6</p>
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Period Number

Represents the energy level (shell) of an element, indicating the number of electron shells.

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Group Number

Indicates the number of valence electrons in the outermost shell of an element.

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isotope

atoms w the same number of protons but diff numbers of neutrons

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ex shell diagram

A visual representation showing the arrangement of electrons in different energy levels around an atom's nucleus. It helps illustrate how electrons are distributed among the shells.

electrons in an atom = atom number (ex oxygen has 8)

<p>A visual representation showing the arrangement of electrons in different energy levels around an atom's nucleus. It helps illustrate how electrons are distributed among the shells. </p><p>electrons in an atom = atom number (ex oxygen has 8)</p>
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orbital diagram

based on electron configurationthat visually represents the distribution of electrons in an atom's orbitals, showing the occupancy of each orbital with arrows for each electron.

<p>based on electron configurationthat visually represents the distribution of electrons in an atom's orbitals, showing the occupancy of each orbital with arrows for each electron. </p>
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Atomic mass formula
Two isotopes of [element] has a mass of X amu and Y% abundance while the 2nd isotope has a mass of Z amu and W% abundance. What is the atomic mass of [element]?

(x)(y%/100)+(z)(w%/100)

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% abundance

two isotopes. 1st: x amu and y% abundance. Other isotope has z amu. What is the % abundance?

subtract 100-first isotope amu (logic bru)