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Evaluation of a Determinant

Fill in the d...

Question

Fill in the details for the element helium.

Details of Helium

Name

Symbol

Atomic Mass

Atomic Number

Number of Protons

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Solution

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Fill in the following blanks in respect of an atom of an element :

No. of protons	No. of neutron	Mass number	Atomic number	No. of electrons	Symbol
11	12	................	................	................	................

Q. An element with mass number

81

31.7 %

more neutrons as compared to protons. Assign the atomic symbol.

Q. An element X has 3 electrons in its third shell. Fill in the following details.

Electronic Configuration
Atomic Number
Name
Symbol

From the symbol $_{2}^{4} H e$ for the element helium, write down the mass number and the atomic number of the element.

Q. ^{M^2+ contains 10 electrons and 10 neutrons
(i) What is atomic number and mass number of the element M
(ii) Is it possible in an atom to have 13 protons and 13 neutrons .
(iii) Why helium gas is inert}

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