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.

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Solution

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(a) False
It was not proposed by J. J. Thompson. Thompson discovered the electron but not the nucleus.
(b) True
The conclusion obtained from gas from cathode rays is that atoms have negatively charged particles called Electrons.
(c) False
The anode rays obtained from all the gases consist of positive ions or cations.

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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 negatively charged particles called electrons.

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.

Everything is made of atoms and every atom has a nucleus composed of positively charged particles called protons, with some neutrally charged particles known as neutrons. The particles that orbit around the nucleus that is negatively charged are known as________.

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?

State whether True or False.

(a) J.J. Thomson proposed that the nucleus of an atom contains only nucleons.
(b) A neutron is formed by an electron and a proton combining. Therefore, it is neutral.
(c) The mass of an electron is about

\frac{1}{2000}

times that of a proton.

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