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POSITIVE AND NEGETIVE (-,+)

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there are two possible charges
positive +
and
negative -

these charges are caused due to the excess or deficiency of electrons

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positive + and negaive - charges

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Positive and negative charges

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Positive+
Negetive-
The amount of electorons in a substance

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There are two charges, positive - (+) and negative - (-)

these charges are due to the loss or gain of electrons

loss of electrons makes the atom positive while the gain makes it negative

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An atom is neutral in nature. But, when an atom loses a certain number of protons or electrons, they become ions. When an atom loses some electrons, the collective positive charges increases, giving it a positive chare, making it a positive ion. When an atom gains some electrons, it gains some negative charges as a whole, giving it a negative charge, making it a negative ion.

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positive and negative charges ( + , - )

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Positive and negative [+, -]
Due to number of electrons in an atom of a substance

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Ananya Patil Rao - Types of Semiconductor 

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Ananya Patil Rao - Types of Semiconductor 

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Intrinsic - only electrons used for conduction are valence electrons of that element e. g pure germanium
Extrinsic- conductors are doped i. e. different elements with free electrons added to semi conductor e.g in Germanium +Arsenic, extra electronic from pentavalent arsenic is used for conduction

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conductors havw low resistivity,semiconductors have higher resistivity

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Conductors- Good conductors of electricity
-Both valence and conduction band are partially filled
Semiconductors-Less conductivity compared to conductors, valence band is completely filled and conduction band is empty

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Metals have high conductivity and low resistivity. Electrons in valence band overflow into conduction band
Semiconductors have intermediate conductivity and resistivity. At absolute zero, no electron has energy to jump to valence band and hence it behaves as an insulator

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Metals are good conductors of electricity but semi-conductors have less conductivity than metals

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Metals - there is an overlap between the conduction band and the valence band
Semiconductors - there is a gap of 1eV between the conduction band and the valence band

-x

Intrinsic Semiconductor - does not contain any impurity
Extrinsic Semiconductor - contains impurities

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Metal-Good conductors
Semi-Conductor-Mix of conductor and insulator

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Semiconductors have gap of 1eV between the conduction band and the valence band .

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1.Nuclear fission
2.sun

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1) Nuclear Fission
2) Sun

Metal: Highly conductive, Current is carried out by flow of free electrons
Semiconductors: Partial conductors,  Current is carried out
by the flow of electrons of positively charged electron holes

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1) Nuclear Fission
2) Naturally ocurs in the sun

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sai

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1.Nuclear fission
2.sun

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1. Nuclear Fission
2. The Sun and other stars

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1.) Nuclear fission
2.) sun

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1) Nuclear fission
2) sun

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fission,sun

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1. Nuclear Fission
2. Sun, Stars

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1)Nuclear Fission
2)Sun

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1. Nuclear Fission
2.  In the Sun

Conductors: Always allow the flow of electric current, and they have a high number of free electrons.
Semiconductors: Allow the flow of electric current only under certain conditions, and they have low no. of free electrons.

Intrinsic Semiconductors are pure and no impurities are added to them.
Extrinsic Semiconductors are impure due to the presence of doping of tetravalent impurities

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1. What is the splitting of a nucleus into smaller nucleus known as?

2. Where does fusion  occur naturally?

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1
metals are conductors they conduct electricity
semiconductors conduct electicity partially
2

metals ahve less free electrons
semicinducotrs ahve intermediate mat of ele trons