Acetylene (c2h2) has a tendency to lose two protons (h1) and form the carbide ion (c2 22), which is present in a number of ionic compounds, such as cac2 and mgc2. describe the bonding scheme in the c2 22 ion in terms of molecular orbital theory. compare the bond order in c2 22 with that in c2.

it would be d. henry moseley

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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.