In the periodic table of the elements, a period is a horizontal row of the table. Elements in the same period have the same number of energy levels.
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Periods in the Periodic Table go horizontally from left to right. Each period represents the number of electron shells an atom has.
Periods on the periodic table are the horizontal rows that go from left to right.
A period on the periodic table refers to a horizontal row of elements, while a group (or family) refers to a column of elements with similar properties. Periods indicate the number of electron shells an atom has, whereas groups reflect the number of valence electrons an element possesses.
The periods on the periodic table represent the number of energy levels an atom's electrons occupy. As you move from left to right across a period, the number of protons and electrons increases, resulting in an extra electron being added to each subsequent element.
The atomic number increases from left to right across the periodic table because the number of protons in the nucleus of an atom increases. This results in a higher positive charge, leading to a stronger attraction to electrons and a closer binding of electrons to the nucleus.
Periods in the periodic table refer to the rows that categorize elements based on the number of electron shells they have. Groups, on the other hand, are the columns that group elements with similar chemical properties based on the number of electrons in their outermost shell (valence electrons).