Why are the lanthanoids and actinoids drawn below the… | StemPy Lab

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Why are the lanthanoids and actinoids drawn below the… | StemPy Lab

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Why are the lanthanoids and actinoids drawn below the main table?

ChemistryEasyHigh School (11–12)The Periodic Table › Development of the Periodic Table A-Level AP Board Exam IB

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Why are the lanthanoids and actinoids drawn below the main table?

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← Moving from left to right across period 3, how does the character of the elements change?Taking the atomic masses K = 39.1, Rb = 85.5 and Cs = 132.9, by how much does the mass of rubidium differ from the mean of the other two? →

More onThe Periodic Table › Development of the Periodic Table

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Which property did Moseley show to be more basic than the atomic mass?Easy
Taking the atomic masses K = 39.1, Rb = 85.5 and Cs = 132.9, by how much does the mass of rubidium…Medium
Moving from left to right across period 3, how does the character of the elements change?Easy
Where is helium placed, and to which block does it belong?Medium
Which general outer configuration belongs to the f-block?Medium

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Problems on this topic

An element of period 4 has the outer configuration 3d⁵ 4s²…Medium
A lanthanoid has the configuration [Xe] 4f⁷ 6s²…Hard
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