Answer:
Explanation: tellurium has an atomic mass of 127.6 whilst the element that comes after it, iodine, is lighter with an atomic weight of 126.9. Mendeleev concluded that the atomic mass for one of these two elements must be wrong because tellurium clearly preceded iodine in the periodic table
Answer:
Hydronium ion
Explanation:
When acids are dissolved in water, the H+ ion reacts with H2O producing the H3O+ ion which is what makes the solution acidic
