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www.reference.com/article/reactive-non-metal-1b32056e1accffee

The most reactive non-metal is fluorine, and it is also the most reactive element that scientists have discovered. Fluorine combines readily with almost any substance, including metals that are usually stable.

www.reference.com/science/metals-reactive-others-73249aa0a7f06fee

A metal atom's aptitude to lose electrons to other atoms causes it to be more reactive. Involved in the scientifically determined aptitude is the speed at which a metal atom can lose electrons, as well as the substances with which the atom is likely to react.

www.reference.com/science/reactive-group-metals-43058d3569fc5d05

The most reactive group of metals on the periodic table are the alkali metals. These metals are so reactive that they are not found naturally by themselves; they are found in nature as parts of compounds.

www.reference.com/science/determines-reactivity-metal-7868062a7f22569

The reactivity of a metal is determined by how tightly the metal holds onto the electrons in its outermost energy level. These electrons are called valence electrons. Metals usually have fewer valence electrons than nonmetals.

www.reference.com/science/reactive-metal-periodic-table-19bd0deb9e76e7ac

The most reactive metal in the periodic table is francium. Francium belongs to the alkali metals, a group on the periodic table whose members are all highly reactive. These metals are highly reactive because they all have only one valence electron.

www.reference.com/article/reactive-metals-found-periodic-table-3d35a9ddc6acfbe9

The most reactive metals found on the periodic table are the alkali metals, which are lithium, sodium, potassium, rubidium, caesium and francium. The alkali metals are found on the periodic table's s-block, because the outermost electron in these elements is in an s-orbital.

www.reference.com/science/reactivity-trend-halogens-5ce8a2863b8eb9a7

The reactivity trend of the halogens is that the higher up on the Group VIIa column the halogen is, the more reactive it is. Therefore, the most reactive halogen is fluorine, while the least reactive, non-radioactive halogen is iodine.

www.reference.com/article/trends-reactivity-hcl-alkaline-earth-metals-d0ee2316ca500422

Each of the alkaline earth metals reacts with HCl, also known as hydrochloric acid, to form hydrogen gas and its corresponding metal chloride solution. The reaction becomes stronger the further down the group the element is on the periodic table.

www.reference.com/article/reactive-metals-react-water-acids-2e58f97f7642772c

The most reactive metals react with water to form hydrogen gas and their oxides or hydroxides, and with acids to form their oxides or hydroxides. According to the activity series, the first nine metals are highly reactive with water and the next six with acids.

www.reference.com/article/reactive-silver-f6b78bc208ae8d41

According to Encyclopedia Britannica, silver is one of the least types of chemically reactive elements. Silver is a chemical element, and the metal is a lustrous and white color.