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1900's Physics and Wave

19. Why the e...

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19. Why the e/m ratio of proton changes from each gas while the e/m ratio of the electron remains same and why the hydrogen atom doesn't have the neutron

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An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?

Q. Do the Mass of electron proton and neutron of every element is same?
means for eg.hydrogen and oxygen atoms have electron proton and neutron in them..so can we say that the mass of electron proton and neutron in hydrogen and oxygen is the same..

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

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(d) an atom must always have a proton, neutron and electron

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