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11y ago
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4mo ago

Lanthanum and actinium are often included in the lanthanide and actinide series of the Periodic Table. These elements have similar properties to the other elements in their respective series, hence the use of asterisks to distinguish them.

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It means that additional elements should be inserted at that spot. To save space, those elements are placed in separate rows.

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6y ago

It means that additional elements should be inserted at that spot. To save space, those elements are placed in separate rows.

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Q: Why were you asked to put asterisks next to lanthanum and actinium?
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