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In which period and group is the element whose electron configuration is Kr5s1?
Group 1- as the configuration is ns1. The Kr in the question indicates the Krypton core. The 5s1 is the clue - the period number is the same as the principal quantum number (in this case 5) so the element is in group 1 and period 5 - so it is rubidium.
A substance which cannot be seperated by ordinary chemical or physical method is an?
It is an element. Elements are composed of atoms, and atoms of elements combine chemically to form compounds.
What is metal element?
Metal is not an element. It is a term used to classify an element, but it is not an element.
Is platinum an element or an compound?
It is an element.
Is sulfur element compound or mixture?
element. Sulfur dioxide (SO2) is a compound
Is there a element ef?
If you meant "element" as in a chemical element, there is no element with the symbol "ef" in the periodic table.
Is helium a good element or bad element?
There is no such thing as a good element or a bad element.
What is the Hebrew word for element?
element = element (אלמנט). If you're asking about an element as in the Periodic Table, then an element in Hebrew is yesod.
What element is in the major compound of steel?
Iron is the major element in steel. Only an element can be an element, and an element can not be a compound, the definition of which requires more than one element.
Is neon a compound or an element?
Neon is an element.
Is iron and an element?
Sand is NOT an element. Iron IS an element.
Is lithium a element a compound or a mixture?
Element
