Question

We haven't seen atom then how can we say that electrons exist in them? ​

Answer 1

Answer:

It's better to think of them as tiny electrical, “planetary” systems. ... The electrons orbit this nucleus, like planets. View image of Atoms are made up of smaller particles (Credit: Science Photo Library/Alamy Stock Photo) If atoms are impossibly small, these subatomic particles are even more so

Answer 2

actually they are proven by theory along with evidence....no one has seen it but we still believe it indirectly.just like no one has seen that Earth rotates and revolves but with the change of day and night and season we came to the conclusion that it does.