This is the type of attraction that holds elements like nickel, sodium and gold together. for these elements, stationary, positive-charge ions are surrounded by a sea of shared, freely-moving electrons.

The answer is metallic bonding as this bond is the one responsible of having to provide attraction in the electrons and atoms that could lead of having substance to be made as a glue in order to provide definite structure and it explains the description above.

metallic bonding

Explanation:

In metallic bonding positive charged metal cations are embedded in a sea of valence electrons. The electrons are not tightly held by a single metal cation. The freely moving electrons endow a metal with all its metallic properties such as ductility, malleability and ability to conduct electricity.  

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.