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This chemical element is calcium (Ca).
Chlorine
No element has the exact same election arrangement as another element. However ion can have the same election arrangement as another element. For example Chloride (Cl-) has the same configuration as Argon, and Potassium (I) (K+) also has the same configuration as argon.
The number and arrangement of electrons.
Chlorine
That is the correct spelling of the plural noun "elements."
There is a sea of delocalised electrons formed in a metallic element, and the ions are attrracted to this.
PCl5 is phosphorous pentachloride. Which is in a trigonal bipyramidal arrangement.
allotrope
i hate spelling
ALLOTROPE
The amount of electrons in each element.