Elements are placed into the same period on the periodic table of the elements because they
question 1 options:

form the same type of chemical bonds.

form the same type of isotopes.

have the same chemical properties.

have the same number of electron energy levels.

Elements are placed into the same period on the periodic table of the elements because they _have the same number of electron energy levels..

Explanation:

The horizontal lines in the periodic table are called periods. Two elements that are in the same period, have the same amount of levels with electrons in their envelope. Example in period 2 are Nitrogen and Oxygen

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hi, natural selection of the peppered moth during the industrial revolution in 19th-century england is an example of an outlier in the study of evolution. during this time, pollution from factories filled the forests, coating trees in a layer of soot—turning white trees black

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