A part of the periodic table is shown. A portion of the first two columns of the periodic table is shown. Column one from top to bottom reads three lithium, 11 sodium, and 19 potassium. Column two reads four beryllium, 12 magnesium, and 20 calcium.

Which of the following elements is less reactive than the others? (5 points)

a. Beryllium (Be)

b. Calcium (Ca)

c. Lithium (Li)

d. Magnesium (Mg)

the answer is learned

these nuts

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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