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Number of valence electrons.
This is because an elements valence electrons determine its bonding and all the rest of its properties. All elements in a group will have similar properties because they all have the same number of valence electrons, aka group number.
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This is because an elements valence electrons determine its bonding and all the rest of its properties. All elements in a group will have similar properties because they all have the same number of valence electrons, aka group number.
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Lithium and potassium have similar chemical properties as the number of valence electrons in the atoms of both elements are the same. Thus option 4 is correct.
Lithium and potassium have been the alkali earth metals belonging to Group 1A of the periodic table. The chemical properties of the elements have been dependent on the reactivity and the bonding with the valence electrons.
The number of valence electrons with both Li and K is the same that is 1, therefore the elements possess similar chemical properties. Thus option 4 is correct.
For more information about chemical properties, refer to the link:
https://brainly.com/question/5186976
