Question

In the gold foil experiment of Geiger and Marsden, that paved the way for Rutherford’s model of an atom, ~1.00% of the a-particles were found to deflect at angles > 50°. If one mole of a-particles were bombarded on the gold foil, compute the number of a-particles that would deflect at angles less than 50°.

July 3, 2024

Answer

% of a-particles deflected more than 50° = 1% of a-particles.

% of a-particles deflected less than 50° = 100 – 1 = 99%

Number of particles that deflected at an angle less than 50

= $99\over100$ × 6.022 × 10²³

= $596.178\over100$ × 10²³

= 5.96 x 10²³

💡 Some Related Questions

How many electrons will weigh 1 g?

An element ‘X’ has mass number 4 and atomic number 2. Write the valency of this element. Will it react with other atoms of different elements?

Explain why chlorine whether as the element or its compounds, always has relative atomic mass of about 35.5.

Complete the following gaps in the given table:

Elements Protons Electrons Neutrons Atomic Number Mass Number

A – – 10 8 –

B 15 – – – 31

C 1 – – – 3

D – 11 12 – –

An atom ‘M’ of an element reacts wit oxygen to from M2O3. Calculate the valency of the element ‘M’.

Composition of the nuclei of two atomic species ‘X’ and ‘Y’ are given below:

X Y

Protons 8 8

Neutrons 8 10

Give the mass number of ‘X’ and ‘Y’ What is the relationship between the two species?

One electron is present in the outermost shell of an element ‘Z’ (a) What will be the nature of this element? (b) What will be value of charge of the ion formed, if this electron is removed from the outermost shell?

An old man and a scientist were talking about a deserted house. The old man was sure that it was haunted by ghosts, but the scientist discarded the view saying no one had ever seen a ghost. The old man was annoyed and challenged the scientist about existence of atoms, sub-atomic particles which also could not be seen. (𝒊) Name the three sub-atomic particles and their discoverers. (𝒊𝒊) Whose viewpoint do you support and why?

Rutherford’s atomic model was a reasonably good model of structure of atom based on at the famous particle scattering experiment. However, it was subsequently modified by Neils Bohr and later on, by others. The resulting improvements in the understanding of atomic structure have greatly contributed to further scientific advancement. There are many other similar examples in scientific field when original contributors happily accept modifications in their ideas. Answer the following questions based on the above information: (𝒊) Name the scientific values associated with above anecdotes. (𝒊𝒊) Give any example from your life experiences so far which reflects display of such a value by you as an individual. (𝒊𝒊𝒊) In what way such a personal attribute is likely to help you?

The given figure depicts the atomic structure of an atom of an element ‘X’. Write the following information about the element ‘X’. (a) Atomic number of ‘X’ (b) Atomic mass of ‘X’ (c) Valence electrons (d) Valency of ‘X’ (e) ‘X’ should be metal or non-metal.