The question between worksheet number 4

Question 1:- What are electrons, Protons, and Neutrons, and where are they situated?

Dalton proposed that the atom is extremely small and indivisible. Later it was discovered that Electrons, Protons, and Neutrons are constituents of an atom. These are called subatomic particles.

Notes:-

Electron

  • Electron was discovered by scientist J J Thomson.
  • Electron is represented by symbol "e".
  • An electron has a negative charge.
  • Electron revolves around the nucleus of an atom in orbits (also known as the shell)


Proton

  • Proton was discovered by scientist E. Goldstein.
  • Proton is represented by the symbol 'p'.
  • Proton has a positive charge.
  • Proton is situated in the nucleus of an atom


Neutron

  • Neutron was discovered by scientist James Chadwick
  • Neutron is represented by symbol 'n'. Neutron is neutral means it has no charge.

  • The neutron is situated in the nucleus.

Worksheet Questions

1. Fill in the blanks

(a) The charge on a proton is.................... 
(b) The charge on electron is ................
(c) .................. discovered the neutron.

(d)................... discovered the electron.

Answer:-
(a) positive,(b) negative,(c) James Chadwik,(d) J.J Thomsons.

2. Complete the following table:-

Answer:-
                      Electron            Proton                     Neutron
(a) Charge     negative             positive                    neutral
(b) Position   around nucleus  situated in nucleus   nucleus
(c) Symbol    e                         p                               n

3. State whether the following statement is true or false.

(a) The neutron has a positive charge.

(b) The electron revolves around the nucleus.

(c) The proton has a positive charge.

(d) Proton and neutron are in the nucleus.

(e) James Chadwick discovered the proton.

Answer:-
(a)false
(b)true
(c)true
(d)true
(e)false

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