Air, Sea water, alloy afe the examples of a) Compound
b) Mixture
c) Element
d) Molecule

B. Mixture

because air,sea water and alloy are example of Mixture

where's the diagram?

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.