Which pair of elements will form a covalent bond?
hydrogen and chlorine
sodium and chlorine
copper and bromine
zinc and bromine

Answer is: hydrogen and chlorine.

Covalent bond is bond between nonmetals. Hydrogen (H) and chlorine (Cl) are nonmetals.

Hydrogen and chlorine will form hydrogen chlorine in chemical reaction:

H₂(g) + Cl₂(g) → 2HCl(g).

Other pairs will form ionic bonds, because one pair is metal (sodium, copper and zinc) and another pair is nonmetal (chlorine and bromine).

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

convalent bond :

is a chemical bond formed by the sharing of electron between 2 atoms.

it is the direct chemical bond between 2 atoms.

in bond formation atoms are involved here.

electrovalent bond:

is a chemical bond defined as electroststic attraction between 2 atoms.

it is the electrostatic attraction between 2 atoms.

in bond formation, ions are involved here.

hope it

and ur welcm

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answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).