What does the arrangement of the periodic table scientists see?
a. patterns in elements’ properties
b. possible isotopes for each element
c. grouping of the elements by color
d. identification of radioactive elements

option A is a precise one to be selected!

the answer

explanation:

the capillary tube was too close to the bottom of the beaker.

the ruler may have moved.

water got into the capillary tube.

the temperature was not allowed to equilibrate in the 2-4 minutes.

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.