Whether the red element indicated is a gas or a liquid or a solid should be determined. Atomic number of blue element, group number of green, blue and red element should be determined. Also, the name of at least one other element which is chemically similar to green element 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 2.35CP

Interpretation Introduction

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Whether the red element indicated is a gas or a liquid or a solid should be determined. Atomic number of blue element, group number of green, blue and red element should be determined. Also, the name of at least one other element which is chemically similar to green element 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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