The fourth and fifth periods have __elements and are called _period.

eighteen

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long

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Solution

Fourth and fifth element contains eighteen elements each.
Therefore, The fourth and fifth periods have eighteen elements and are called long period.

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Similar questions

Q. (a) Explain why:
(i) All the elements of a group have similar chemical properties.
(ii) All the elements of a period have different chemical properties.

(b) The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are :

(a) A, B, C (b) B,C,D (c) A, D, E (d) B, D, E

When we move down a group a shell is added inspite of that the fourth and fifth period both have 18 elements each why?

What does a period signify in a peroidic table?

All the different elements are arranged in a chart called the periodic table.

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The fourth and fifth periods have ________elements and are called _______period.

Fourth and fifth element contains eighteen elements each.Therefore, The fourth and fifth periods have eighteen elements and are called long period.

The fourth and fifth periods have __elements and are called _period.

Fourth and fifth element contains eighteen elements each.
Therefore, The fourth and fifth periods have eighteen elements and are called long period.