“The periodic table is a tabular method of displaying the elements in such a way, that the elements having similar properties occur in the same vertical column or group”. Earlier attempts of the classification of elements: Dobereiner’s Triads, Newland’s law of octaves. Dobereiner’s Triads: This… Read More »class 10 science chapter 5 notes english
Covalent Bond: The atomic number of carbon is 6. Its electronic configuration is 2, 4. It requires, 4 electrons to achieve the inert gas electronic configuration. But carbon cannot form an ionic bond. It could gain four electrons forming C4- cation. But it would be… Read More »class 10 science chapter 4 notes english
Metals: Physical properties of metals, chemical properties of metals and non-metal oxide. Metals are the elements that conduct heat and electricity and are malleable and ductile. Examples are Iron (Fe), Aluminium (Al), Silver (Ag), Copper (Cu), Gold (Au), Platinum (Pt), Lead (Pb), Potassium (K), Sodium… Read More »Class 10 science chapter 3 notes english
I. रोडवेज:भारत के पास दुनिया का सबसे बड़ा सड़क नेटवर्क है। इसका महत्व देखा जा सकता है।(i) सड़कों की निर्माण लागत रेलवे लाइनों की तुलना में बहुत कम है।(ii) सड़कें तुलनात्मक रूप से अधिक विच्छेदित और लहरदार स्थलाकृति को पार कर सकती हैं।(iii) सड़कें ढलानों… Read More »class 10 geography chapter 7 notes hindi