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2.calcium
3.magnesium
4. They all had the properties that Mendeleev had predicted table. All three of these elements have the same number of protons and neutrons and the same properties. They were all discovered by Mendeleev before he published the first periodic table. All three of this elements have the same atomic number, and atomic mass and the same properties.
5. The three elements were actually unknown to science until the time Meledeev devised the periodic table. This made him to predict the atomic mass and other characteristics of these three elements, and technetium, with great accuracy. They called these predicted elements ekaboron(eb), ekaaluminium(ea) (galium), ekamanganese (em) (techetium), and ekasilicom (es) (germanium)
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