Question

2. What are the horizontal rows and vertical columns in the Modern periodic

table called as ?

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Answer 1

Explanation:

The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

Answer 2

Answer:

the vertical columns on the periodic table are called groups.The horizontal rows on the table are called periods.