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a
1. Which property must be known about each atom in order to draw an electron-dot
structure?
a. Bond length
6 Atomic mass
c. lonization energy
d. Number of valence electrons
Num
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Explanation:

D. Number of valence electrons.

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.