The three indicated red element and their group should be determined. Whether these elements are catrgorized as metals, nonmetal or semimetals should be determined. Also, whether these elements should be expected to have similar or different properties should be determined. Concept introduction: Periodic table represents a systematic arrangement of elements according to their chemical and physical properties. Here, elements are represented as a two-letter symbol and are arranged in increasing order of atomic number . Periodic table contains 18 groups (columns) and 7 periods (rows). In periodic table, groups from 1-2 and 13-18 are known as main group elements. The 10 middle groups from 3-12 are known as transition elements . There are also 14 elements that started with lanthanum known as lanthanides and 14 elements started with actinium are known as actinides.

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Chapter 2, Problem 2.37CP

Interpretation Introduction

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The three indicated red element and their group should be determined. Whether these elements are catrgorized as metals, nonmetal or semimetals should be determined. Also, whether these elements should be expected to have similar or different properties should be determined.

Concept introduction:

Periodic table represents a systematic arrangement of elements according to their chemical and physical properties. Here, elements are represented as a two-letter symbol and are arranged in increasing order of atomic number. Periodic table contains 18 groups (columns) and 7 periods (rows). In periodic table, groups from 1-2 and 13-18 are known as main group elements. The 10 middle groups from 3-12 are known as transition elements. There are also 14 elements that started with lanthanum known as lanthanides and 14 elements started with actinium are known as actinides.

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