(A) In the periodic table,the horizontal rows are called $Periods$. The period number corresponds to the highest principal quantum number $(n)$ of the

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Periods and Groups; Principal quantum number and valence shell configuration respectively.

(A) In the periodic table,the horizontal rows are called $Periods$. The period number corresponds to the highest principal quantum number $(n)$ of the elements in that row.The vertical columns are called $Groups$. Elements in the same group have the same valence shell electronic configuration,which leads to similar chemical properties.

Class 11 Chemistry Classification of Elements and Periodicity in Properties Extended or long form of periodic table

Easy

What are the horizontal rows and vertical columns in the periodic table called? What do they represent?

A
Periods and Groups; Principal quantum number and valence shell configuration respectively.
B
Groups and Periods; Valence shell configuration and principal quantum number respectively.
C
Rows and Columns; Atomic mass and atomic number respectively.
D
Series and Families; Electronegativity and ionization energy respectively.