Asingle covalent bond involves two atoms sharing one pair of electrons. true false

The given statement is true.

Explanation:

When there is sharing of an electron between two atoms then the bond formed between them is covalent bond.

For example, atomic number of calcium is 20 and its electronic configuration is 2, 8, 8, 2. Whereas atomic number of fluorine is 9 and its electronic configuration is 2, 7. So, in order to attain stability calcium will donate its extra electron to fluorine atom and thus readily combines with two fluorine atoms.

Thus, we can conclude that the statement a single covalent bond involves two atoms sharing one pair of electrons, is true.

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.