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Periodic Classification of elements (Notes) NCERT

Dobereiner’s traids When elements are arranged in the. Order of increasing atomic masses, group of three elements known as traids, having similar properties are obtained. The middle element of the traid being equal to the arithmetic mean of the atomic masses of the other two elements.  Following are the examples. 1. The alkali Metal group Elements Symbols Atomic masses Lithium Li 7 Sodium Na 23 Potassium K 39 2. Alkaline Earth metal group Elements Symbols Atomic masses Calcium Ca 40 Strontium Sr 88 Barium Ba 137 3. The halogen group Elements Elements Symbols Atomic masses Chlorine Cl 35.5 Bromine...
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What is Clip Art in PowerPoint

Pictures perform a very good role in making our presentation effective, good-looking. In this article, we learn how to insert images as well as what is clip art. A single piece of ready made art is called Clip Art. Clip Art Gallery is the place where these ready single piece of art is stored. In this gallery different types of clips related to schools,computer, books etc. You can also insert a Clip Art ( A ready made picture) by performing the following steps. 1. Click on Insert menu. 2. Select Clip Art option.     The clip art pane will appear on right hand of the window. 3. A Search box appear, type the keyword related to the picture you are looking for.   4. Press Enter button OR Click on go button.   5. Select the picture which you want to insert in your slide. The selected picture will be inserted in your slide.   
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Overhead Projectors (defination, working, uses, advantages and disadvantages) | HPBOSE

Projectors are basically used for presenting our ideas among others. In starting Projectors are mainly used in educational fields. Today we use projectors in educational fields as well as in business fields. In this article, I will show the projectors used in past that is Overhead Projectors. This topic is also listed in HP board computer science syllabus. Let's start with his definition. What is Overhead projector? Overhead projectors or OHP's are the type of projector used for project images on large flat wall. It has a flat transparent top and a light source beneath transparent top and reflecting mirror and a fan to cool it. Above the box there is a long arm that has a mirror to catch and redirect the light towards the screen. Uses of Overhead Projectors  OHP is one of the most frequently used tool in education and training. Today, we use digital projectors in the place of OHP which is smaller in size as compared to OHP. Advantages of OHP 1. OHP's not much g...
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