Question

how to predict the group and period of f-block elements? write the period and group of Lanthanum?​

Answer 1

$\huge\bold\red{ANSWER:-}$

Many periodic tables place lanthanum and actinium in the f-block of elements, for example, this periodic table from Los Alamos National Laboratory.

However, this table from the Royal Society of Chemsitry places lanthanum and actinium in the d-block.

Lanthanum and Actinium are generally both accepted as f-block elements. You will notice in the Royal Society's periodic table, La and Ac are both color coded to match the other f-block elements. They do this to show the beginning of both the Lanthanide and Actinide series, while maintaining a reasonable symmetry for their periodic table (that is, without "holes" in their table, similar to the first link you provided).

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Answer 2

Answer:

Prediction of period, group and block of a given element. The period of an element corresponds to the principal quantum number of the valence shell. The block of an element corresponds to the type of orbital which receive the last electron.

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