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Fluorine, chlorine, bromine, iodine, and astatine have 7 valence electrons.

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2 valence electrons for calcium and 7 for chlorine.


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What element have 7 valence electrons?

Fluorine is the element that has 7 valence electrons.


Which symbols represents a chlorine ion with a stable arrangement of eight valence electrons?

Cl-


What don you notice about the number of valence electrons as you move from left to right across a row or the period in the periodic table na-mg-al-si-p-s-ci-ar?

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There are 20 valence electrons in CH2Cl2. C => 4 e-* x 1 (number of C in chemical formula) = 04 v.e-** H => 1 e- x 2 = 02 v.e- Cl => 7 e- x 2 = 14 v.e- CH2Cl2 = 20 v.e- *e- - this means electrons in short form **v.e- - this means valence electrons in short form


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