The History of the Atom The History of the Atom Democritus first proposed an atomic model. He said that all matter could be divided into smaller and smaller pieces until a single indivisible particle was reached. He called this particle an atom after the Greek word ‘atomos’ meaning not cuttable. He believed that different atoms are of different sizes‚ have regular geometric shapes and are always in motion. He also said that there is empty space between atoms. Aristotle severely criticized Democritus’
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What are the parts of an atom? Where are the subatomic particles found? The atoms are the smallest units of matter with their own chemical characteristics. The atoms are divided into 2 parts. The first part is the central nucleus and the electron cloud. The central nucleus contains very heavy particles and the electron cloud contains very light moving particles. The subatomic particles are the protons‚ neutrons‚ and the electrons. They are located within the atom and the electrons spin rapidly
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In the past benzene was obtained from the distillation of coal in the absence of air. Today most benzene is made syntheticallyfrom petroleum products. The benzene is a closed ring of six atoms connected by bonds that resonatebetween single and double bonds; each carbon is also bound to a single atom. Benzene isinsoluble in water but mixes in all proportions with organic . Benzene is itself an excellentsolvent for certain and for most simple organic chemicals. It is one of the most commonly
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****Atoms Think and Compare: Page 331 Q-3 Consider these atoms: hydrogen H‚ aluminum Al‚ argon‚ Ar. Rank them‚ from smallest to largest‚ in order of (a) size; (b) number of protons in the nucleus; (c) number of electrons. In order of size from smallest to largest: Hydrogen H‚ Argon Ar‚ Aluminum Al. In order of proton from smallest to largest: Hydrogen H‚ Aluminum Al‚ Argon Ar. In order of electron from smallest to largest: Hydrogen H‚ Aluminum Al‚ Argon Ar. Q-4 Consider these atoms: helium
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history of 1945‚ we come to know the history of 1945; we come to know the worst type of nuclear disaster the world had witnessed. On August 6‚ 1945 an atom bomb was dropped on HIROSHIMA in Japan‚ which devastated the entire town killing 66‚000 people and injuring nearly 69‚000. On August 9‚ 1945 another atom bomb was dropped on NAGASAKI. This bomb killed nearly 39‚000 people and injured more than 25‚000. Nuclear weapons are thus‚ far more destructive and harmful to the society than any other weapon
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Diwali rituals Diwali‚ the festival of lights‚ is one of the important and widely spread holidays celebrated in India. It is a celebration of lights‚ and for many‚ it is truly a sensory experience; some families decorate their houses with all sorts of lights and open up to the neighbors‚ sharing their love and their food. Those celebrating Diwali spend time with family and friends. They perform religious ceremonies to bring in wealth and prosperity for a new year‚ cook and eat delicious food
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Diwali The Festival Of Lights An ancient celebration with deeply spiritual roots‚ this Festival of Lights is technically a tradition with a religious foundation‚ but all that are willing to share in the season of abundance are welcome. Thousands of oil lamps‚ fireworks‚ lavish feasts‚ fragrant flowers and colored sand in the form of lotus blossoms adorn India in this annual homecoming that is Diwali. The festival has its roots in ancient Indian texts and it stands for
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a year of waiting‚ Diwali arrived. Everyone’s house would be lighted up with lamps & joy. Almost everyone loves celebrating Diwali. Though I’m an atheist‚ I also like this festival as it lights up the world. But along with bit happiness for the arrival of Diwali‚ I get lots of worry every year. Whatever you say‚ Diwali‚ along with bunch of other festivals & functions‚ are tagged with some key words – crackers‚ pollutions‚ global warming & noise. However we celebrate this Diwali; we can’t remove these
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Diwali (also spelled Devali in certain regions) or Deepavali‚[1] popularly known as the "festival of lights"‚ is an important five-day festival in Hinduism‚Jainism‚ and Sikhism‚ occurring between mid-October and mid-November. For Hindus‚ Diwali is one of the most important festivals of the year and is celebrated in families by performing traditional activities together in their homes. Deepavali is an official holiday in India‚[2] Nepal‚ Sri Lanka‚ Myanmar‚Mauritius‚ Guyana‚ Trinidad & Tobago‚ Suriname
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CHEMISTRY UNIT 2 STRUCTURE OF ATOM The rich diversity of chemical behaviour of different elements can be traced to the differences in the internal structure of atoms of these elements. After studying this unit you will be able to • know about the discovery of electron‚ proton and neutron and their characteristics; • describe Thomson‚ Rutherford and Bohr atomic models; • understand the important features of the quantum mechanical model of atom; • understand nature
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