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प्रश्न
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
उत्तर
(a) The element X has 2 valence electrons because it belongs to group 2.
(b) Since the number of valence electrons and the valency of group 2 elements is 2, the valency of element X is 2.
(c) Group 2 is on the left side of the periodic table which consists of metals. Therefore X is a metal.
(d) The name of the element is Magnesium (Mg), since X belongs to group 2 and the 3rd period.
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संबंधित प्रश्न
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| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Noble gas?
