In right triangle efg, me = 25. in right triangle hjk, mh = 25. which similarity postulate or theorem proves that efg and hjk are similar?

The postulate or theorem which proves that EFG and HJK triangles are similar is Angle-Angle  (AA)

according to it

In case of two triangles if two pairs of corresponding angles are congruent, the triangles are considered to be similar triangles.

2b2t

explanation:

2b2t

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.