Links related to chapter 2 in Arabic
Atoms
https://eu-lti.bbcollab.com/recording/4503fe077c3e4bf69c377a5049176501
Atomic numbers
https://eu-lti.bbcollab.com/recording/0655a3bebd3d43b69f72775e95d820bc
Ions, naming compounds
https://eu-lti.bbcollab.com/recording/6e2fc2b26e6b4a2ebfcfecef768df16e
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