The top number on each of the element tiles represents the atomic mass. Why is that top number different from the atomic number below it?

a.
Electrons and protons make up the mass of an atom while just the electrons determine the atomic number.

b.
Protons and electrons cancel each other out, so the atomic number is smaller than the atomic mass.

c.
Neutrons have no charge, so they are not considered for either number.

d.
Protons and neutrons make up the mass of an atom while the atomic number is determined by just protons.

water and alcohols have similar properties because water molecules contain hydroxyl groups that can form hydrogen bonds with other water molecules and with alcohol molecules, and likewise alcohol molecules can form hydrogen bonds with other alcohol molecules as well as with water.

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.