Strand A, section 1 (Atomic structure)

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Last updated 9:50 PM on 8/9/26
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5 Terms

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Atomic number (Z)

= number of protons = number of electrons in a neutral atom

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Mass Number (A)

= protons + neutrons

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Isotopes

Same element, different neutron count. Average atomic mass on the periodic table is a weighted average of all naturally occurring isotopes.

<p>Same element, different neutron count. Average atomic mass on the periodic table is a weighted average of all naturally occurring isotopes.</p>
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Electron configuration

Fills sublevels in order (Aufbau principle)— 1s, 2s, 3s, 3p, 4s, 3d, 4p… Each orbital holds 2 electrons.

<p>Fills sublevels in order (Aufbau principle)— 1s, 2s, 3s, 3p, 4s, 3d, 4p… Each orbital holds 2 electrons. </p>
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Noble gas shorthand

Replace the core electrons with the symbol of the previous noble gas, e.g. Na= [Ne] 3s1.

<p>Replace the core electrons with the symbol of the previous noble gas, e.g. Na= [Ne] 3s1. </p>