State two main postulates of Thomson's model of an atom.
(N/A) Thomson's model of an atom is based on the following two postulates:
$(i)$ An atom consists of a positively charged sphere in which the electrons are embedded,similar to seeds in a watermelon or plums in a pudding.
$(ii)$ The negative and positive charges are equal in magnitude. Therefore,the atom as a whole is electrically neutral.
$(i)$ An atom consists of a positively charged sphere in which the electrons are embedded,similar to seeds in a watermelon or plums in a pudding.
$(ii)$ The negative and positive charges are equal in magnitude. Therefore,the atom as a whole is electrically neutral.
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Similar Questions
Electrons possess a negative charge,and protons possess a positive charge. An atom contains both,but why does it have no net charge?
Easy
View SolutionThe following data represents the distribution of electrons,protons,and neutrons in atoms of four elements $A, B, C, D.$
Element Protons,Neutrons,Electrons $A$ $9, 10, 9$ $B$ $16, 16, 16$ $C$ $12, 12, 12$ $D$ $17, 22, 17$
Answer the following questions:
$(a)$ Give the electronic distribution of element $B.$
$(b)$ The valency of element $A$.
$(c)$ The atomic number of element $B.$
$(d)$ The mass number of element $D$.
| Element | Protons,Neutrons,Electrons |
| $A$ | $9, 10, 9$ |
| $B$ | $16, 16, 16$ |
| $C$ | $12, 12, 12$ |
| $D$ | $17, 22, 17$ |
Answer the following questions:
$(a)$ Give the electronic distribution of element $B.$
$(b)$ The valency of element $A$.
$(c)$ The atomic number of element $B.$
$(d)$ The mass number of element $D$.
Medium
View Solution$(a)$ $_{12}^{24} Mg$ and $_{12}^{26} Mg$ are symbols of two isotopes of magnesium. Compare atoms of these isotopes with respect to:
$(i)$ composition of their nuclei.
$(ii)$ electronic configuration and valency.
$(b)$ Give the reason why two isotopes of magnesium have different mass number.
$(i)$ composition of their nuclei.
$(ii)$ electronic configuration and valency.
$(b)$ Give the reason why two isotopes of magnesium have different mass number.
Medium
View SolutionDalton's atomic theory successfully explained which of the following laws?
$(i)$ Law of conservation of mass
$(ii)$ Law of constant composition
$(iii)$ Law of radioactivity
$(iv)$ Law of multiple proportion
$(i)$ Law of conservation of mass
$(ii)$ Law of constant composition
$(iii)$ Law of radioactivity
$(iv)$ Law of multiple proportion
Medium
View SolutionWrite three observations of Rutherford's alpha particles scattering experiment.
Medium
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