As Physics AQA A - Inside the atom!?

a) The overall charge off the atom is neutral, so if it has lost 2 electrons, it now has 2 more protons than electrons so is positively charged. Q = 2 x charge of electron = 3.2 x 10^-19 C

b) No of protons = No of electrons = Atomic number = 29

No of neutrons = Mass no - Atomic no = 63 - 29 = 34

No of nucleons = 63 = Atomic no.

c) Q = 3.2 x 10^-19 C

Specific charge = Q/mass = Q/ (29 x Mass of proton) + (34 x Mass of neutron) + (29 x Mass of electron)

Hope this helps...

The question pretty simple....

Now the number of electrons in a neutral atom of copper is 29, i.e. Its atomic number....now two electrons are lost so the number of electrons are now 27. Now we know that each electron has -1.6*10^(-19).....so the ion of copper will have 2*(+1.6*10^(-19)) which is equal to 3.2*10^(-19)....now you must be wondering why 2e charge, that is because when two electrons will be removed, there will be two more protons than number of electrons.....now for any atom the number of nuleons is always equal to the atomic mass number i.e. 69 in this case....the number of protons and neutrons are known as nucleons collectively....now for calculating specific charge, divide the charge we found by 63*10^(-3) i.e. Mass of copper atom in kilogram.....so

the answer will be 0.0046*10^(-17)Ckg^-1.....that will be all....

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