# How can I write the formula for strontium fluoride?

##### 1 Answer

The correct answer is

Let us see how we got the answer; Look at the electronic arrangement of Sr and F atom.

Sr ( Z= 38) has 38 electrons with following electronic configuration. 1

It loses two electron in its 5s subshell to achieve stability and forms ion

F ( Z=9) on the other hand has nine electrons and wants to gain one more electron to achieve stable noble gas configuration.Fluorine atom on gaining one electron forms negative fluoride ion,

F( Z=9) = 1

Two Fluorine atoms gains one electrons each ( total of two) from one Sr atoms, each Sr atom loses two electrons ( one each) to two chlorine atoms , in this process each Sr atom becomes

so in all we have one

so the formula becomes Sr

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