3995943
Description
| Question | Answer |
| reatlative isotopic mass | the mass of an atom of an isotope compared with 1/12th of the mass of an atom of carbon-12 |
| relative molecular mass | is the weighted mean mass of a molecule compared to 1/12th of the mass of an atom of carbon-12 |
| molecular formula | •is the actual number of atoms of each element that is present •we use it for simple compounds |
| group 1 metals | •forms a M+ ion •called the alkali metals |
| silver | ag+ |
| ammonium | NH4+ |
| group 2 | • form M2+ ions • called the alkaline earth metals |
| copper | Cu2+ |
| cobalt | Co2+ |
| zinc | Zn2+ |
| lead | Pb2+ |
| group 3 | • form M3+ ions |
| chromium | Cr3+ |
| group 7 | • called the hallide ions • form X- ions |
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