Four bells toll at interval of 8,9,12 and 14 minutes respectively. If they toll together at 10 a.m. when will they toll together next?
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Elements fall in same group with similar properties.
ii. So, all the element that have same number of valance electrons belongs to the same group.
iii. Thus, Elements belonging to the same group have the same valency.
2) Metallic properties of the elements change to non metallic properties as one moves from left to right in a
period of periodic table.
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