9th Class Chemistry

structure of atom 9th chemistry

Chapter 2 STRUCTURE OF THE ATOM – 9th Class Chemistry Notes

Q#1) What is atom? Write in short words about history of atoms? Answer: In 585 B.C, Ancient Greek philosopher Democritus suggested that matter is composed of tiny indivisible particles called atoms.The name ATOM was derived from the Latin word Atomos meaning indivisible. Daltons Atomic Theory : In 1808 John Dalton put forward his Atomic Theory. According to this theory …

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Chapter 1 FUNDAMENTALS OF CHEMISTRY – 9th Class Chemistry Notes

Question#1) Write a short note on history of chemistry? Answer:History of Chemistry: Chemistry derived its name from word alchemy, which is a European word derived from the Arabic word al-kimia. Alkemai is the old name of Egypt. The word alcheme, khame, kheme means black earth. It refers to the black soil crust of Egypt. When the …

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