If a bond were to form between 2 elements, which of the pairs shown would be held together by a nonpolar covalent bond? Hydrogen and hydrogen Lithium and chlorine Aluminum and oxygen Hydrogen and chlorine

Hydrogen and hydrogen

Explanation:

A nonpolar covalent bond is formed when there is little or no electro negativity difference between the two bonding atoms in a covalent bond. This implies that the shared electron of the covalent bond is placed at an equidistant position from the nuclei of the two bonding atoms.

A bond between hydrogen and hydrogen is a homonuclear covalent bond, there is no electro negativity difference between the bonding atoms hence the covalent bond formed will be nonpolar.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.