leverso
leverso
05.05.2020 • 
English

1. halogens a family within the nonmetals (family 17) on the periodic table 2. noble gases a family of non-reactive gases (family 18) on the periodic table 3. stair-step a diagonal division on the periodic table that divides the metals from the nonmetals and along which lay the metalloids

try to get them to mach

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