Many events are periodic. The seasons and the calendar are periodic. If you have a music lesson every Tuesday after school, it is a
periodic event. Which statement best explains why the table of
elements is periodic?
A.
All elements are included in the table.
B. It has rows and columns, as a calendar does.
C. Properties of the elements repeat in a cycle or repeating
pattern.
D. It has many different parts, each of which is different from
other parts.

answer: mercury

explanation:

the answer is true. hope it .

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