This video explains the basic structure of atom , the subatomic particles, the difference in the structure of atom and an ion.
For more resources check:
t.me/camscience (IGCSE, need telegram app)
t.me/camscience2 (A levels)

This video defines and explains isotopes with examples, also teaches calculating relative isotopic mass and explains the uses of various radioisotopes.
for more resources:
t.me/camscience
t.me/camscience2 (needs telegram app)

this video explains the electronic structure/configuration of first 20 elements along with the diagramatic form.
for more resources check:
t.me/camscience
t.me/camscience2 (telegram app)

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