It is potassium.
kalium is the latin name for potash,(pot ashes) which is what potassium is named for.
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You simply have to learn them. Many of the more common elements were discovered and named long before the English language and so their symbols are derived from their original names. Examples: Iron = Fe from ferrum Gold = Au from aurum Sodium = Na from natrium Potassiom = K from kalium
No, but sometimes "average" means "mean" - when it doesn't mean median, geometric mean, or something else entirely.
The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.The answer will depend on who you mean by HE.
See mean-8. Or get a dictionary.
There is no statistical term such as "deviation mean".