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Sia ? 4 years, 4 months ago
the following rules are followed for writing the number of electrons in different energy levels or shells.
(i) the maximum number of electrons presents in a shell is given by the formula 2n2 where ′n′ is the orbit number of energy level index 1,2,3... hence the maximum number of electrons in different shells are as follows :
First orbit or K-shell will be = 2 × 12 × 2 Second orbit or L shell will be = 2 × 22 = 8 third orbit or M shell will be = 2 × 32 = 18 fourth orbits or N-Shell will be = 2 × 42 = 32 and so on.
(ii) The maximum number of electrons that can be accommodated in the outermost orbit is 8.
(iii) Electrons are not accommodated in a given shell unless the inner shells are filled. That is the shells are filled in a stepwise manner.
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Two type of conducting tissues in plants exist namely:
1) Xylem : It serves as conducting tissue for water and minerals from root to leaves and stem (aerial parts), (unidirectional flow).
2) Phloem : It transports food material from leaves to other parts of plants (bidirectional Flow)
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Motion is always relative. Based on the energy of the particle under motion, the motions are classified into two types:
- Bounded Motion
- Unbounded Motion
In bounded motion, the particle has negative total energy (E<0) and has two or more extreme points where the total energy is always equal to the potential energy of the particle i.e the kinetic energy of the particle becomes zero.
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Posted by Aaditya Thorat 4 years, 4 months ago
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The days are gone when kids would roam freely on streets and birds would fly in the sky. Such a nice scene has been very rare to see, nowadays. We should blame ourselves only! India was a land of villages; our culture arose from villages only. But than we did something so bad that we are paying the price of it even today. We have replaced the major part of earth with factories, mills and building causing pollution.
There are Various Levels at which Urban Pollution is happening like:
Types and Causes of Urban Pollution
- Air Pollution: The air in the urban areas is always polluted with harmful substances and it is becoming hazardous day by day to breathe. The air in the cities is choking. The smoke from automobiles, factories and power generators make the air unhealthy. There are other factors also like chemical spills and other toxic gases that contaminate the air.
- Water Pollution: As it is there are very less natural water sources in the urban areas and the ones that are there are getting increasingly polluted. There is a lot of disposal in the lakes and rivers like household & industrial disposal. A lot of waste gets mixed with rain and washed into the waters.
- Soil Pollution: The mixing of toxins in the soil is disturbing the eco-system.
- Noise Pollution: Urban areas are one of the noisiest ones. Various sources of noise pollution include traffic noises, loud-speakers and other unwanted noises cause many health issues.
- Radioactive Pollution: The accidental leakage by nuclear power plants poses a big threat.
- Visual Pollution: The over exposure of visuals in the cities in the form of signs, billboards, screens, high intensity lights etc. are also quite disturbing.
- Other than these there is also ‘Thermal pollution’ that is caused by excessive amount of heat trapped in earth’s atmosphere.
Posted by Ankit Pandey 4 years, 4 months ago
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V. Ridhanya Catherine 4 years, 4 months ago
1Thank You