s touto otázkou si neviem rady (viď. obrázok)
A ešte táto otázka neviem či to má byť takto:
"Atóm prvku má v obale 80 elektrónov. Čo viete určiť z tejto informácie ?" - Podľa mňa - je to ortuť a vlastne počet elektrónov v atómovom obale je rovnaký ako počet protónov v atómovom jadre ... tak to treba vysvetliť ? neviem či je to dobre :-( ....
Moc krát ďakujem za pomoc :-)
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