If the mass of protons is same for the atoms of all elements,then why e/m of the positively charged particles in anode rays differ from gas to gas?

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Solution

Anode rays are composed of ionised nuclei which differ from gas to gas in terms of atomic & mass numbers. When the gas is changed, the e/m ratio of the positively charged ions obviously changes because the number of neutrons in the nucleus of each gas can be different and the number of protons in one nucleus of each gas is also different.Thus, e/m value of anode rays is different for different gases.

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Q. Assertion :e/m ratio of anode rays is independent of nature of gas. Reason: All anode rays are protons

State whether the following statements are true or false:
(a) Thomson proposed that the nucleus of an atom contains protons and neutrons.
(b) The cathode rays obtained from all the gases consist of negetively charged particles called electrons.
(c) The anode rays obtained from all the gases consist of positively charged particles called protons.

Q. why did the mass and charge of anode rays depend on the gas taken whereas the cathode rays properties were independent of the gas taken

Q. The charge to mass ratio for the particles of the cathode rays obtained from different gases was found to be the same while the charge to mass ratio for the particle. Of the anode ray obtained from different gases was found to be different.why?

Fill in the blanks in the following statements :

(a) The number of protons in the nucleus of an atom is called its ....................

(b) The total number of protons and neutrons in the nucleus of an atom is called its ....................

(d) An atom of an element has 11 protons, 11 electrons and 12 neutrons. The atomic mass of the atom is ....................

(e) If the nucleus of an atom has atomic number 17, mass number 37 and there are 17 electrons outside the nucleus, the number of neutrons in it is ....................

(f) Almost all the mass of an atom is concentrated in a small region of space called the ....................

(g) Cathode rays are a beam of fast moving ....................

(h) The anode rays obtained from hydrogen gas consist of particles called ....................

(i) The maximum number of electrons that can be accommodated in L shell are ....................

(j) The maximum number of electrons that can go into the M shell is ....................

(k) The subatomic particle not present in a hydrogen atom is ....................

(l) The electron has .................... charge, the proton has .................... charge, and the neutron has .................... charge.

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