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4 years ago

Which of the following neutral elements has the same electron configuration as the bromide ion, Br−?

Physics

1 answer:

NikAS [45]4 years ago

5 0

Answer:

B) krypton

Explanation:

Electron configuration of Br: [Ar] 3d10 4s2 4p5

Since we have the bromide ion with a negative charge, Br's atom acquired an electron and therefore another electron is added to the electronic configuration .

Electron configuration of Br-: [Ar] 3d10 4s2 4p6

And now this electronic configuration coincides with that of Krypton as we see below :

Electron configuration of Kr: [Ar] 3d10 4s2 4p6

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Answer:

$v=0.9714c$

Explanation:

The kinetic energy possessed by particles will be

$K.E=\frac{1}{2}Mc^2$

where,

M is the mass of the particle (7920938.3 MeV/c²)

c is the speed of the light

Also,

energy of the proton particle = $\frac{m_pc^2}{\sqrt{1-\frac{v^2}{c^2}}}$

where,

v is the velocity

m_p is the mass of the proton (938.3 MeV/c²)

since the energy is equal

thus,

$\frac{m_pc^2}{\sqrt{1-\frac{v^2}{c^2}}}=\frac{1}{2}Mc^2$

$1-\frac{v^2}{c^2}=[\frac{2m_p}{M}]^2$

substituting the values in the above equation, we get

$1-\frac{v^2}{c^2}=[\frac{2\times 938.3 }{7920}]^2$

$v=0.9714c$

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