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Yogita Ingle 7 years, 3 months ago
- Diamagnetic substances contain no unpaired electrons in their atoms
- Helium Symbol is He with atomic number -2. and its electronic configuration-1s²
- Here last orbital contains 2 electrons which is the maximum capacity that an orbital can hold.and both the electrons in s orbital are paired.
- So, helium has no unpaired electrons and It is diamagnetic in nature.
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Yogita Ingle 7 years, 3 months ago
Orbit :
- An orbit is a well defined circular path around the nucleus in which the electrons revolve.
- It represents the planar motion of an electron around the nucleus.
Orbital :
- An orbital is the three dimension space around the nucleus within which the probability of finding an electron is maximum (upto 90%).
- It represents the three dimensional motion of an electron around the nucleus.
Posted by Utkarsh Singh 7 years, 3 months ago
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Yogita Ingle 7 years, 3 months ago
| Emission Spectra | Allotropic Spectra |
| Emission spectra get defined as the electromagnetic radiation that a source emits. | Absorption Spectra gets defined as the electromagnetic radiation that a substance absorbs. |
| The lines that occur during the emission spectra show some spark. | The lines that occur during the absorption spectra shows some dip in the spectrum. |
| Emission does not depend on matching ones and carries out at any level. | Absorption requires some degree of wavelength for the process to carry itself out. |
| Does not have many color changes because it only focuses on a path and few dark colors. | Different colors are present as the frequencies will have their own lines. |
| Visible at many levels of lines of frequencies. | Only occurs at the frequencies that match at the same time. |
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Yogita Ingle 7 years, 3 months ago
- Surface corrosion forms an oxide layer. It acts as a barrier for air and moisture and thereby preventing the inner metal from corrosion.
- Some metals like zinc act as sacrificial anodes to prevent corrosion to other metals.
- Galvanic corrosion is the principle that is used in batteries. Here, two metals carbon and zinc are intentionally mixed together in a electrolyte solution where zinc corrodes faster in order to generate electrical charge.
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Sia ? 4 years, 7 months ago
| Particle | Wave |
| 1) A particle is a small quantity of matter under consideration. | 1) Wave is associated with to and from motion. |
| 2) Localized point in space | 2) Delocalized point in space |
| 3) Energy depends upon mass and velocity of the particle, E=mc2 | 3) Energy depends upon wavelength and velocity E=hv=(hc)/λ |
| 4) It does not show interference. | 4) Shows interference. |
| 5) Simultaneous existence of two or more particle. | 5) Simultaneous existence of two or more particle will be favoured. |
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Yogita Ingle 7 years, 3 months ago
A thermodynamical system is said to be in thermal equilibrium when macroscopic variables (like pressure, volume, temperature, mass, composition etc) that characterise the system do not change with time.
In Thermodynamics we consider only the state of the object which means we will only consider macroscopic variables like pressure, volume and temperature.
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Vibhav Prakash Srivastava 7 years, 3 months ago
There are two reasons behind it
1.High melting point- it increases the life span of the bulb
2.High resistivity- due to it enough energy produces & bulb able to emit light.
Anjali Panwar 7 years, 3 months ago
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