26.2 mL of a 0.450 M hydrochloric acid solution is titrated with an unknown concentration of sodium hydroxide. 45.8 mL of the sodium hydroxide solution is required to reach the equivalence point. What is the molar concentration of the sodium hydroxide solution?

Explanation:

(a) Balanced equation

NaOH + HCl ⟶ NaCl + H₂O  

(b) Moles of HCl

(c) Moles of NaOH

(d) Molar concentration of NaOH

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.