@@brezagay6622 Sorry for the late response as I am on vacation. 1. Every element will have a slight difference in energy between n1 and n2. Therefore a different energy photon would be required to cause a transition. 2. An electron could be used to cause a transition. However, the energy transfer would have to be exactly equal to the energy difference. If the incoming electron had enough energy it could cause ionisation (the other electron leaving the atom)

@@learningwithphilimon Is electron cloud is a realy thins exist ? i mean if we somehow could capture an atom with electron dont know can we see that cloud ?

and what it is conssits off

'Electron cloud' is just an expression. We do not know where exactly electrons are in an atom. There is just a higher probability of finding electrons in certain positions depending on the orbitals they occupy. As far as I know we can use electron microscopes to view atoms, but nothing smaller. We would not see electrons or a cloud. If you Google "electron microscope image of atoms" you can see the images that have been captured.

@@learningwithphilimon i just want to know if it real and exist or not but the majorty is arguing each other

Thank you! 😁

This is a good question! In my next few videos I will go into more detail for groups 1 and 7. For example, the alkali metals (group 1) react with water to form a metal hydroxide (aqueous) and hydrogen gas. The halogens (group 7 or 17) form diatomic molecules. The reactivity decreases down the group. The noble gases (group 8 or 18) are monoatomic gases that are unreactive. As you can see it is hard to answer this question in a single comment ☺️

I am glad I could help! 😊

I am glad that you found the video useful! 😁

What kind of information are you looking for?

Thank you! I wish I had more time to make videos. I might get to quantum mechanics at some point 😅

haha, I appreciate it! 😁

Thank you!

Focusing on chemistry for now :)

I am glad it has helped you!