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प्रश्न
What are the two main features of Rutherford’s atomic model?
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उत्तर
According to Rutherford’s model an atom consists of:
- The centrally located nucleus: The nucleus is a centrally located positively charged mass. The entire mass of the atom is concentrated in it. It is the densest part of the atom. Its size is very small as compare to the atom as a whole.
- The outer circular orbits: Electrons revolve in circular orbits (shell) in the space available around the nucleus. An atom is electrically neutral i.e., number of protons and electrons present in an atom are equal.
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संबंधित प्रश्न
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
Name the particles which actually determine the mass of an atom.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Define the term ‘mass number’ of an atom.
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]
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
