The height of a place from the sea level is called​

Mean level

The elevation is the height of point that is found above the sea levels and these levels is called as the average or the mean level and has an average height above the surface and can be seen the rise and the fall of the tides in an open coastal area over a period of 19 years

Altitude, like elevation, is the distance above sea level. ... This is called indicated altitude, and is measured by an instrument called an altimeter. As altitude rises, air pressure drops.

Explanation:

it takes on an electronical energy

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