Which element is the most reactive?

Fluorine is the most reactive element due to its high electronegativity

The periodic table has two groups; metal and non-metal elements and so to answer your question I will focus on each group and identify the most reactive element out of each group. The most reactive element is Fluorine in the non-metals group and Caesium in the metals group. Due to both these elements being different 'types' of elements it is difficult to make a comparison of reactiveness and state which one is more reactive. Thus, each one must be seen as being the most reactive in their own groups. I hope that helps!

Aluminium is the most reactive element it's atomic number is 13. Al is its symbol. Finally, the most reactive elementary group is alkali metals situated far apart from intermediate metals and noble gases.

Fluorine is identified as the most reactive non-metal and the most electronegative element in the periodic table, making it the strongest oxidizing agent. Caesium is the most reactive metal in the periodic table, so much so that working with this metal often ends in explosions! If you wish to know more about the periodic table or want to learn some key things to remember, please let me know.

Most reactive metal > Bottom of Group 1(alkali metals) in the the Periodic Table = Francium (Fr).

Most Reactive no metal > Top of Group 7 (the halogens) in the periodic table = Fluorine (F).

Flourine is the most react element in the period table, this is due to it having an almost full outer electron shell of 7 electrons, its outer most shell being closer to the nucleus than other elements in Group 7. It is also the most electronegative element in the table, meaning it will react violently with elements in Group 1 & 2, as they are electropositive.

fluorine is the most reactive.

Fluorine (F) is identified to be the most reactive element in the periodic table. It's need to gain an electron to form a a full outer shell (2,8) gives rise to it being the most reactive.

Sodium (Na) is the most reactive element since it’s valence electrons are not tightly held together in the atom. It’s atomic number is 11, therefore when writing the electron configuration (2,8,1), the last electron which is 1 is the valence electron which is easily lost to other ions for stability.

K (Potassium) is the most reactive element. It stays at the top of the periodic table. It can lose its valence electron easily hence it's the most reactive element.

Fluorine (F) is the most reactive element in the periodic table. It needs to gain an electron to complete its outermost shell to form (2, 8).

fluorine is the most reactive element

Without a doubt Fluorine. It's what we call the most 'electronegative' element on the periodic table, which means that it has a nuclear charge density that really likes positive charge.

Fluorine as it just need one electron to form a full outer shell

Cesium is the most reactive element as its second from the bottom of this group