A worker pressed large pieces of salt into this concrete sidewalk while it was wet. When it dried, he washed the sidewalk. What happened to the salt? a.
it dissolved in the water

b.
it evaporated into a gas

c.
it turned into concrete

it means there are 3 atoms of oxygen

12 is it do you think so

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.