Question

why there are only two series in F block in periodic table​

Answer 1

The known f-block elements come in two series, the lanthanides of period 6 and the radioactive actinides of period 7. All are metals. Because the f-orbital electrons are less active in determining the chemistry of these elements, their chemical properties are mostly determined by outer s-orbital electrons.

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Answer 2

Answer:

The Periodic Table arranges elements in blocks as each type of orbital fills with electrons - s,p,d,f,g,h. Alkali metals and alkaline earths are s-block filling (but could be one s-block slot). ... Filling the f-block are 14 elements, lanthanoids and actinoids.

Explanation:

The known f-block elements come in two series, the lanthanides of period 6 and the radioactive actinides of period 7. All are metals. Because the f-orbital electrons are less active in determining the chemistry of these elements, their chemical properties are mostly determined by outer s-orbital electrons.