How are the periods, or horizontal rows, on a periodic table ordered from left to right? (2 points) by similar state of matter. by increasing number of protons. by decreasing number of neutrons. by similar

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asked Mar 20, 2019 16.1k views

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How are the periods, or horizontal rows, on a periodic table ordered from left to right? (2 points)

by similar state of matter.
by increasing number of protons.
by decreasing number of neutrons.
by similar number of valence electrons.

Chemistry
high-school

Ceyko asked

by Ceyko

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#2
They are ordered by increasing number of protons (aka atomic number)

Joews answered Mar 26, 2019

by Joews

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