They bound using ionic bounding, the metal gives away electrons and the non-metal receive, and since electrons are negative in charge the metal becomes positive and the non-metal negative this makes them attract each other, that's what ionic compounds are mostly hard. They bound because the "aim" for an atom is to get an full outer shell. the group number will tell you how many outer electrons it has (don't get fooled by some periodic tables where all the rows are labeled it is actually just the rows which "stands up" you can see this in the other will normally say it next to themex: Fe(iii)= three outer electrons.) and the outer shell normally want 8 electrons.
ex:
Li F
Group 1 Group 7
Li+ F-
there are many non metals that are very very reactive. some are even more reactive than some certain metals. there are no exact answers to that but according to me, it should be fluorine. HOPE THIS PIECE OF INFORMATION PROVES TO BE USEFUL
Sodium, magnesium, and aluminum are examples of fairly reactive metals that are commonly found as ores in the Earth's crust. These metals can be extracted from their ores through processes such as electrolysis or chemical reactions.
Sodium is a non-ferrous metal. Ferrous metals contain iron, while non-ferrous metals do not. Sodium is a soft, silvery-white, highly reactive metal that belongs to the alkali metal group in the periodic table.
Alkali metals
Choices: a) eject, retain B) lose, gain c) retain,gain d) gain, lose e) lose, retain
The most reactive non metals are Halogens which may combine most of the metals as well as non metals.
Atoms of non-metals usually gain or share electrons when they react with other atoms.
one reacts and one doesn't
Alkali metals are most reactive metals. Halogen family comprises of highly reactive non-metals.
Group-17 are most reactive non-metals. They form halogens.
Hydrogen
Non-metals do not show displacement reactions because they are less reactive than metals. Displacement reactions occur when a more reactive element displaces a less reactive element from its compound. Since non-metals are not as reactive as metals, they are not typically displaced in reactions.
Alkali metals
Some are but the most reactive are also non-metals.
Most active non-metals have atoms with strong electronegativity, allowing them to readily gain electrons to achieve a stable electron configuration. This high electron affinity makes these atoms highly reactive, often forming covalent bonds with other elements to complete their outer electron shell. Examples of highly reactive non-metals include fluorine and oxygen.
Halogens.
Most non-metals are not highly reactive or an completely inert. However, the Halogens in Group 17 are reactive with nearly every substance on the planet.