Answer:
c when electrons drop down from a high energy level they emit a photon.
Explanation:
I think the half of 1293 its the mass ? maybe idk I just tried
<span>the following element that is most reactive </span>would be Fluorine
<h2>
Answer:</h2>
<h3>Hg2 ( NO2 )2</h3>
<h2>Explanation:</h2>
<h3>Formula of mercury ( 1 ) dioxonitrate 111 is Hg2 ( NO2 )2//</h3>
