These elements have similar chemical properties because they have the same valence electrons.
What is valence electrons?
A valence electron is just a negatively charged particle that could be transferred to and is found in the atom's outermost shell.
What is elements?
A pure substance made up entirely of atoms with the same number of protons in respective nuclei is known as an element.
Therefore, these elements have similar chemical properties because they have the same valence electrons.
To know more about valence electrons.
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