Question

An element in the 7th period is an artificial element. Identify the block and give another characteristic of the elements belonging to this block. ​

Answer 1

Francium and radium make up the s-block elements of the 7th period. Francium is a chemical element with symbol Fr and atomic number 87. It was formerly known as eka-caesium and actinium K. It is one of the two least electronegative elements, the other being caesium.

A block of the periodic table is a set of elements unified by the orbitals their valence electrons or vacancies lie in.[1] The term appears to have been first used by Charles Janet.[2] Each block is named after its characteristic orbital: s-block, p-block, d-block, and f-block.

Answer 2

Answer:

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Explanation:

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