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Please help!!! Which location represents a period on a Periodic Table?

a row on the left and right of the table
a vertical row
a horizontal row
a diagonal row on the periodic table

Respuesta :

kailey2007
A horizontal is a period on the periodic table
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Answer:

the 3rd answer horizontal row

Step-by-step explanation:

In each period (horizontal row), the atomic numbers increase from left to right. The periods are numbered 1 through 7 on the left-hand side of the table. Elements that are in the same period have chemical properties that are not all that similar.

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