mam i am not able to understand the structure of the atom & metal defination .

Dear student,                                                                                                                                                                      
Please find below the solution to the asked query    
          
Atoms are composed of three type of particles: protons, neutrons, and electron, protons and neutron and it has a spherical structure in which the proton and neutron are situated in center of the circle and the electrons revolve round in fixed circular orbits with fixed energy.

For example, some atoms are given as:

Metals are shiny solids with high melting points. They are malleable (can be beaten into thin sheets), Ductile (can be stretched into wire) and good  electrical conductors and heat conductors. 

Hope this information will clear your doubts about the topic.   
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Regards                             

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