METALLOIDS: Characteristics: ○ on the stair-step line that divides the metals from the nonmetals. ○ exhibit properties that are intermediate.

electrons. ▫ Periodic Trends include: ▫ Reactivity. ▫ Atomic radius (size). ▫ Ionization energy.

The periodic table is a chart containing information about the atoms that make up all matter. • An element is a substance made up of only one type of atom. • ...

The following is teacher background information and should only be used with students after they have completed the interactive periodic table lesson.

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In this Unit, we will study the historical development of the. Periodic Table as it stands today and the Modern Periodic. Law. We will also learn how the ...

Chapter Summary. 1. Modern periodic table (long form of the periodic table). • Elements are arranged in order of their increasing atomic number. • It consists ...

In the present lesson we shall discuss the need, genesis of classification and periodic trends in physical and chemical properties of elements. OBJECTIVES.

In Class IX we have learnt that matter around us is present in the form of elements, compounds and mixtures and the elements contain atoms of only one type.

In these lessons, students will be introduced to the periodic table and the history of its creation. Students will also learn of the make-up of the periodic ...