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Physics 18 Online
OpenStudy (safari321):

this is the best website

OpenStudy (anonymous):

help me pls

OpenStudy (safari321):

okay what do you need

OpenStudy (anonymous):

Which element has six energy levels? rubidium (Rb) cesium (Cs) potassium (K) sodium (Na)

OpenStudy (safari321):

the element is sodium

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