Why are the alkali metals and the halogens among the most reactive elements on the periodic table?
Alkali metals only have one valence electron and halogens only need one electron to complete their outer valence shell. This means that they will be extremely reactive with all other elements.
What elements are more likely to react with other elements those on the far left or on the far right of the periodic table?
Far left. Depends on what you mean by far right. If you mean the halogens - fluorine, chlorine then they are also very reactive like the alkali metals on the far left - lithium, sodium, potassium etc. One big difference is the alkali metals get more reactive as they get bigger and the halogens are more reactive as they get smaller.
Halogens and Alkali metals are the most reactive becasue of electrons. Alkali metals loose an electron and it becomes violent, halogens gain and electron violently. This is becasue all elements want to have a full valence shell of electrons. When alkali metals loose an electron they become positive Cations.
The Periodic Table is a table of elements although metals are in it. There are 5 types of categories for the elements. From left to right there are the Alkali Metals, Alkali Earth Metals, Transition Metals, Halogens, and Noble Gases. There is also a list on the bottom called the Intransition Metals. The Noble Gases are the most unreactive category out of all the others.
Alkali Metals (group 1) because they only need to lose one electron in order to have a stable valence level of 8. As you go down the alkali metals group, the elements become more reactive. So Francium is the most reactive alkali metal. Also, Halogens, because they already have 7 electrons and only need to gain one in order to have a stable valence level of 8. As you go up the halogens group, the…
Group 1, or the alkali metals, left of the table and Group 17, the halogens, right of the table are the most reactive groups. Fr, or Francium (atomic number 87) is the most reactive metal- and fluorine the most reactive halogen. Francium and fluorine would react together explosively they are so reactive.
As you move left on the periodic table, the elements get more reactive and as you move down the periodic table. Using that thinking the most reactive elements are the Alkali Earth Metals (column 1) and the most reactive element is Francium. The least reactive are the noble gases in the last column- Helium, Neon, Argon etc..
The reactivity of elements can be deduced from the reactivity series. For example, sodium is "higher" than zinc in the reactivity series, hence sodium is more reactive than zinc. The reactivity of elements are also linked to their positions in the periodic table. For example, in group I (alkali metals), the reactivity increases down the group. On the other hand, for group VII (halogens), the reactivity decreases down the group.