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the elements that have similar properties because they have same number of valence electrons are

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Solution

Elements in group have this behaviour. That is due to the same number of valence electron they have same properties. For ex., Li,Na,K,Rb,Cs have same properties as they have ns¹ electrons. Similarly if you take halgoens F,Cl,Br,I they show same properties as they have 7 valence electrons.

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Q. Two elements that have similar properties because they have the same number of valence electrons are:

Q. Assertion :Elements belonging to the same group have similar chemical properties. Reason: Elements of a group have same number of valence electrons.

Q. Elements of the same group have similar valance shell electronic configuration. Hence they exhibit similar chemical properties. But elements of the same period have different valencies.

Comment on the above statement.

Q. When elements are placed in the order of their increasing atomic number,
the elements having the same number of __________ is repeated in such a way, so as to fall under the same group. Since, the electronic configuration of the valence shell electrons is same they show similar properties.

Assertion: Elements with the same chemical properties are kept in the same group.

Reason: Elements in a group have the same number of electrons in the outermost shell hence they have similar chemical properties.

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