Advertisements
Advertisements
प्रश्न
The ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,
- what will be the ratio of their sizes?
- If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.
Advertisements
उत्तर
i. Volume of the sphere = `4/3 π"r"^2`
Let R be the radius of the atom and b be that of the nucleus = R = 105r
Volume of the atom = `4/3 "rR"^3`
= `4/3 π (10^5 "r")^3`
= `4/3 π"r"^3 xx 10^15`
Volume of the nucleus = `4/3 π"r"^2`
Ratio of the size of atoms to that of nucleus
= `(4/3 xx 10^15 xx π"r"^3)/(4/3 π"r"^3)`
= 1015
(ii) If the atom is represented b the planet earth (R = 6.4 × 106 m) then the radius of the nucleus would be
rn = `"R"_"n"/10^5`
rn = `(6.4 xx 10^6 "m")/10^5`
= 6.4 × 10 m
= 64 m
APPEARS IN
संबंधित प्रश्न
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
Fill in the following blanks in respect of an atom of an element
| No. of protons | No. of neutron | Mass number | Atomic number | No. of electrons | Symbol |
| 11 | 12 | ___________ | ___________ | ___________ | ________ |
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State Valency of each element
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State (i) Valency of each element (ii) which one is a metal (iii) which is non-metal (iv) which is an inert gas
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Phosphorus – \[\ce{^31_15P}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Lithium [At. no. = 3, Mass no. = 7]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Sodium [At. no. = 11, Mass no. = 23]
What is atomic number?
The atomic number and the mass number of an element is 26 and 56 respectively. Calculate the number of electrons, protons and neutrons in its atom. Draw the structure.
The Atomic number of an element is 20. It has ______ valence electrons.
What is the relation between mass number & atomic number?
