Many events are periodic. The seasons and the calendar are periodic. If you have a music lesson every Tuesday after school, it is a periodic event. Which statement best explains why the table of elements is periodic?
A. It has many different parts, each of which is different from other parts.
B. All elements are included in the table.
C. It has rows and columns, as a calendar does.
D. Properties of the elements repeat in a cycle or repeating pattern.

thats a little if u want the answer just look it up on google thats what i do haha : )

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.