Which part of John Dalton's theory is no longer accepted today? A. Atoms cannot be destroyed or divided into smaller particles.
B. Atoms are rearranged during chemical reactions.
C. Atoms combine in different ways to form chemical compounds.
D. Atoms are made of positively and negatively charged particles.

if you're asking what comes out, it's steam.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.