In the modern periodic table, the order in which the elements are placed is based on
A)atomic mass.
B)mass number.
C)atomic number.
D)atomic size.
E)chemical reactivity.

Question

Quizplus · Accepted Answer

The modern periodic table is arranged in order of increasing atomic number, which is the number of protons in an atom's nucleus. This arrangement groups elements with similar chemical and physical properties together in columns, or groups, and also allows for the prediction of an element's properties based on its position in the table.

In the Modern Periodic Table, the Order in Which the Elements