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The element placed with cerium, in the table formed by Newlands' was:

1. actinium
2. lanthanum
3. lawrencium
4. zirconium

Correct answer: lanthanum

Solution

In Newlands’ early classification, cerium was placed with lanthanum because both were rare-earth elements with similar chemical behavior. The other options are not the historical companion of cerium in that table.

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