3. Caculate the amount of thermal energy required to raise 2.5kg of Zinc
From a temperature of 50°C to 65°C, (Solve for O)(C=388 JkOC
specific heat of zinc)

i think   the answer is c hope i'm right

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.