Building Vocabulary Match each term with its definition by writing the letter of the correct definition on

the line beside the term.

a.

9. diatomic molecule

10. halogen

11. metalloid

12. inert gases

13. nonmetal

14. semiconductor

a type of element that has some of the charac-

teristics of metals and some of nonmetals

b. a family of unreactive elements whose atoms

do not gain, lose, or share valence electrons

c. formed of two atoms

d. a substance that carries electricity under

certain circumstances, but not under other

circumstances

a type of element whose physical properties

are generally opposite to that of metals

f. a family of very reactive elements whose atoms

gain or share one electron

e.

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84

i have no clue hope you find the answer

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o

the seeing the electronic configuration we can say that the element is fluorine.

fluorine is the most electronegative element in the periodic table.

but by only seeing the configuration we cannot say about its reactivity because we don't know if its configuration after excitation or by addition of electrons.

but if not then, it is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. as the most electronegative element, it is extremely reactive: almost all other elements, including some noble gases, form compounds with fluorine.