Poly(methyl acrylate) and poly(methyl methacrylate) are similar polymers. draw the chemical structures and explain which of the two polymers will have the higher glass transition temperature ? a number of poly(alkyl methacrylates) are available. explain how the glass transition temperature will change with increasing alkyl chain length?

i do not get it   at all

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.