Question

question 1
what is a covalent bond?
a chemical bond involving the sharing of valence electrons between two atoms.
a chemical bond involving the sharing of core electrons
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a chemical bond involving an atom losing an electrons to another atom.

Explanation:

A covalent bond is formed when atoms share valence electrons. Core electrons are in inner shells and not involved in bonding. Option 3 is a joke. An atom losing an electron to another atom is an ionic bond (transfer of electrons), not covalent (sharing).

Answer:

A. A chemical bond involving the sharing of valence electrons between two atoms.