The ratio of the radii of hydrogen atom and its nucleus is ~ 10⁵. Assuming the atom and the nucleus to be spherical,
(i) What will be the ratio of their sizes?
<(ii) If atom is represented by planet earth ‘R_e ’ = 6.4 ×10⁶ m, estimate the size of the nucleus.

Academic Chemistry NCERT Class 9

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Updated on: 19-Jan-2023

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(a) What is the nucleus of an atom and what is the nature of charge on it?(b) Name the scientist who discovered the nucleus of atom.
The ratio of radii of two cylinders is 1:2. If the ratio of their height is 2:1, then what will be the ratio of their volumes?
What is the positive charge on the nucleus of an atom due to?
Give the evidence for the existence of nucleus in an atom.
The ratio of the radii of two wheel is 2:5. What is the ratio of their circumferences ?
The ratio of volumes of two cones is $4 : 5$ and the ratio of the radii of their bases is $2:3$. Find the ratio of their vertical heights.
The diameters of two silver discs are in the ratio 2:3 . What Will be the ratio of their areas
The radii of two cylinders are in the ratio $2 : 3$ and their heights are in the ratio $5:3$. Calculate the ratio of their volumes and the ratio of their curved surfaces.
On the basis of Rutherford’s model of an atom, which sub-atomic particle is present in the nucleus of an atom?
The ratio of radii of two cylinders is 1:2 and the heights are in the ratio 2:3. The ratio of their volumes is_____.
Two cones have their heights in the ratio $1 : 3$ and the radii of their bases in the ratio $3:1$. Find the ratio of their volumes.
The nucleus of an atom has 5 protons and 6 neutrons. What would be the (a) atomic number, (b) mass number, (c) the number of electrons, and (d) the number of valence electrons, per atom of this element?
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 ....................(c) An atom has atomic mass number 23 and atomic number 11. The atom has .................... electrons.(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.
Give the unit to measure the size of an atom and give the size of the hydrogen atom.
The average age of a woman and her daughter is $25\ yr$. The ratio of their ages is $7: 3$, respectively. What will be the ratio of their ages after $9$ yr?

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