pb is the symbol of - lead, The mass of the atom is concentrated in the - nucleus, neutral particles exist in the nucleus - protons, the third energy level is saturated with - 18 electrons, the maximum number of energy level - 7 levels, inactive element - Ar,

Výsledková tabule/Žebříček

Vizuální styl

Možnosti

Přepnout šablonu

Obnovit automatické uložení: ?