Question

give three features of period​

Answer 1

Explanation:

Main features of mendeleev's Periodic Table:

(a) There are seven horizontal rows in the periodic table. They are called periods and are numbered from 1 to 7.

(b) In a given period, there is regular gradation in the properties of elements from left to right.

(c) There are eight vertical columns in the periodic table. These are named as groups. They are numbered from I to VIII. Groups I to VII are subdivided into subgroups A and B.

Answer 2

Answer:

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a period in the periodic table is a row of chemical element .All elements in a row have the same number of eletrcon shells .Each next elements in a period has one more proton and is a less metallic than it predeacesssor

Explanation:

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