Explanation
An element is a pure substance distinguished by the number of protons (i.e atomic No.) in its atomic nucleus.
Nucleus is very small in size in comparision to the size of the atom but carries the entire mass of the atom i.e contains all neutrons and protons.
Positron is lighter particle as position is as heavy as an species.
Tritium is one of the isotope of hydrogen. Its composition is 1 electron, 1 proton and 2 neutron.
Rutherford α-particles scattering experiment showed existence of nucleus. According to Rutherford every atom consists of α small central part which has positive charge and almost all the mass of atom which is called nucleus.
Tritium has 2 neutrons and 1 proton.
Balmer series in atomic hydrogen is observed in visible region.
On moving away from the nucleus, the difference between energies of adjacent levels decreases.
Mass No. = No. of Neutrons + No. of protons.
The no. of neutrons and protons are not equal.
The lines in the spectrum are called Balmer series.
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