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प्रश्न
What is nucleus of an atom? Compare its size with that of the atom. Name its constitutents. How is the number of these constituents determined by the atomic number its atomic model.
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उत्तर
The nucleus at the centre of atom, whose size is of the order of 10-15 m to 10-14 m.
The size of a nucleus is 10-5 to 10-4 times the size of an atom. It consists of protons and neutrons.
If Z is the atomic number and A is the mass number of an atom, then the atom contains Z number of electrons; Z number of protons and A - Z number of neutrons.
The atom is specified by the symbol \[\ce{^A_Z X}\] where X is the chemical symbol for the element.
संबंधित प्रश्न
Name a gas caused by the Greenhouse effect
An electromagnetic radiation is used for photography in fog. [2]
(i) Identify the radiation.
(ii) Why is this radiation mentioned by you, ideal for this purpose ?
State two dissimilarities between the γ-rays and X-rays.
Name two radioactive substances.
What are the types of emission?
State three common properties of beta rays and cathode rays.
From α, β and γ-rays, name the one which travels with the speed of light?
