Why cobalt was placed before Nickel in mendeleevs periodic table though it had a higher atomic mass than Nickel?????????????
Answers
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In Mendeleev's periodic table the elements are arranged according to their atomic no. and not atomic masses because of the elements were arranged according to their atomic masses then 1 atom would take more than two places incase of isotopes. Therefore even though Cobalt has more atomic mass then nickel it is placed before Nickel.
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Answer:
While the Mendeléev's Periodic Table is actually based on atomic mass, there are a few exceptions such as Cobalt and Nickel when it comes to being placed in the right order.
This is because we also see whether the elements suit the properties of the element next in the group. Lithium has the same properties as Sodium, so we can say that Lithium and Sodium belong in the same group as each other. What about Cobalt and Nickel? The main reason is that they suit the elements which are next in the group.
Cobalt, Rhodium and Iridium share similar properties, whereas Nickel, Palladium and Platinum share similar properties, so it makes sense that Mendeléev put them in the same group considering the fact that chemical properties of the elements are also a major basis of the Mendeléev's Periodic Table other than atomic mass.
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