Question

number of period in each block of periodic table
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Answer 1

There are seven horizontal rows of the periodic table, called periods. The length of each period is determined by the number of electrons that are capable of occupying the sublevels that fill during that period.

The period to which a given element belongs can easily be determined from its electron configuration. For example, consider the element nickel (Ni). Its electron configuration is [Ar]3d84s2. The highest occupied principal energy level is the fourth, indicated by the 4 in the 4s2 portion of the configuration. Therefore, nickel can be found in the fourth period of the periodic table.

Based on electron configurations, the periodic table can be divided into blocks denoting which sublevel is in the process of being filled. The s, p, d, and f blocks are illustrated below.

The horizontal rows of the periodic table are called periods.

The length of a period depends on how many electrons are needed to occupy the sublevels that fill the period.

Blocks indicate which sublevel is being filled.

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