Tag: structure
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Class 9th – STRUCTURE OF ATOM (Models)
DIFFERENT MODEL OF ATOM PROPOSED BY DIFFERENT SCIENTIST MODEL PROPOSED BY J.J THOMSON According to him, the atom consist of positively charged sphere and all the electrons are embedded in it. The positive and the negative charge are equal in number, thus making the atom neutral . POSTULATES: Atom consist of positive charge all over…
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Class 9th – STRUCTURE OF ATOM (Atomic & Mass Number)
We have already discussed the model of an atom and also were the subatomic particles are present inside an atom. Atomic Number As we know that the protons are present inside the nucleus , so the atomic no. of an element is defined as the number of protons present in an atom. Therefore, atomic number…
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Class 9th – STRUCTURE OF ATOM (Subatomic Particles)
We have already discussed in the chapter of atoms and molecules, how atoms are made and how molecules are made. In this chapter we will study in detail about the structure of Atom. An atom is made up of 3 sub-atomic particles; Protons. Electrons. Neutrons. PROTONS The discovery of proton was done by E. Goldstein.…