The open spaces in the table are to be filled. Concept introduction: The elements in a modern periodic table are arranged in an increasing order of their atomic number . The horizontal rows are known as periods, and vertical columns are known as groups. There are 7 periods and 18 groups in a modern periodic table. They are categorized into groups based on the type of energy sublevel that the last valence electron of the element enters.

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Chapter 5, Problem 50E

Interpretation Introduction

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The open spaces in the table are to be filled.

Concept introduction:

The elements in a modern periodic table are arranged in an increasing order of their atomic number. The horizontal rows are known as periods, and vertical columns are known as groups. There are 7 periods and 18 groups in a modern periodic table. They are categorized into groups based on the type of energy sublevel that the last valence electron of the element enters.

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