Out of the following statements select the correct statement s 1 Elements in a Period have same numb...........

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Out of the following statements select the correct statement(s)

1. Elements in a Period have same number of Valence electrons.

2. Elements in a Period have same number of shells

3. Elements in a Group have same number of electrons in the outermost shell

4. Elements in a Group have similar chemical properties

Select the correct answer using the codes given below.

1 only

1 and 2

1, 2 and 3

1, 3 and 4

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Explanation:

Elements in a Period have no same number of shells Each shell can contain only a fixed number of electrons: The first shell can hold up to two electrons, the second shell can hold up to eight (2 + 6) electrons, the third shell can hold up to 18 (2 + 6 + 10) and so on. The general formula is that the nth shell can in principle hold up to2(n2) electrons.