Which statement is true about the modern periodic table?
A.
Most elements are non-metals.
B.
The elements are laid out in order of relative atomic mass.
C.
D.
Elements in the same group have the same number of electrons in the outer shell.
From left to right, elements in the same period, use an increasing number of
electron shells.

The periodic table organizes elements by increasing atomic number, with elements in the same group displaying similar outer electron configurations and filling of electron shells.

Explanation:

Elements on the periodic table are organized in order of increasing atomic number, not atomic mass. Elements in the same group have the same number of electrons in their outer shell. From left to right across a period, elements use an increasing number of electron shells.

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