Which of the following substances would lose its heat the fastest?
A Lead, 0.129 J/g C
B Mercury, 0.14 J/g C
C iron, 0.45 J/g C
D zinc, 0.388 J/g C

answer///carbon;

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.