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Mole Concept and Avogadro's Number

Mass number o...

Question

Mass number of silicon is

A

23

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B

28

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C

27

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D

25

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Solution

The correct option is B 28
The mass number of silicon is 28.Mass number is the total number of protons and neutrons in a nucleus.

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Similar questions

Q. What is the electronic configuration of silicon [Atomic no.=14, Mass number=28]?

Q. The ratio of the neutrons present in nitrogen atom and a silicon atom is:

(Mass number of nitrogen and silicon is 14 and 28 respectively)

Q. Assertion :The number of electrons in a p-type silicon semiconductor is less than the number of electrons in a pure silicon semiconductor at room temperature. Reason: It is due to law of mass action.

Q. What mass of phosphorous is needed to dope

1.0 g

of silicon so that the number density of conduction electrons in the silicon increased by a multiply factor of

10^{6}

10^{16} m^{- 3}

in pure silicon.
(Take the concentration of silicon atoms

n_{Si} = 5 \times 10^{28} m^{- 3} Molar mass of silicon M_{Si} = 28.1 g Molar mass of phosphorous M_{P} = 30.97 g Avogadro number N_{A} = 6.023 \times 10^{23})

Q. An atom of silicon has a mass number of

29

. How many neutrons does it have?

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