Social Sciences, asked by a9601901319z57, 11 months ago

answer me please fast

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Answered by Anonymous

1

Halogen, any of the six nonmetallic elements that constitute Group 17 (Group VIIa) of the periodic table. The halogen elements are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), and tennessine (Ts)..You can choose any two from them...

2) Mendeleev realized that the physical and chemical properties of elements were related to their atomic mass in a 'periodic' way, and arranged them so that groups of elements with similar properties fell into vertical columns in his table.

Answered by rockayush68

1

chlorine, iodine

based on atomic weights and physical properties

select a braienlist

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