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1,2 and 13-18 the number is how many valence electrons it has.

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15y ago

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What does the number at the top of each column in the periodic table mean?

The number at the top of each column in the periodic table is the group number. It indicates the number of valence electrons an element in that column has, which influences its chemical properties. Elements in the same group tend to have similar chemical behavior due to their shared number of valence electrons.


What does the number on top of the symbol mean in the periodic table?

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I am assuming you mean to ask why elements go into specific groups Elements that have the same number of valence electrons are put into the same group. Because they all have the same number of valence electrons, it could also be said that elements are put into groups based on their chemical properties.


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Groups are made of these columns that go up and down?

Groups in the periodic table are made of columns that go up and down and are called groups or families. Each group/family has elements that share similar chemical properties because they have the same number of electrons in their outermost energy level.


What does it mean to be in the same group?

In the periodic table, elements in the same group, or family, have similar properties. This is because the number of valence electrons is consistent within groups. For example, the Noble Gases all have 8 valence electrons.


What does the period number on periodic table mean?

The group number is an identifier used to describe the column of the standard Periodic Table in which the element appears.