Question
Groups and Periods of Modern Periodic Table
| Groups | Periods |
| (i) Vertical columns of elements in the Modern Periodic table are called Groups. | (i) Horizontal rows of elements in the Modern Periodic table are called periods. |
| (ii) There are 18 groups in the Modern Periodic table. | (ii) There are 7 periods in the Modern Periodic table. |
| (iii) The group number indicates the valence electrons in the outermost shell. | (iii) The period number indicates the number of shells in the atoms of an element. |
| (iv) The elements in the same group have similar chemical properties. | (iv) The elements in a period exhibit gradual change in properties from left to right. |
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