Electrolytes are defined as those compounds which: have covalent bonding produce less lowering at the freezing point than do compounds like sugar have only ionic bonds dissolve in a solvent such as water to produce a solution which conducts electric current easily

you did not give any options thus this is the best answer i can give to you with this little information you have given

> they are both natural and not man made

> they can be tracked and predicted by the right tools

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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.  

d : a person who learns about the world by observing it. no that is not a smiley face

explanation: