The area of a square is 200 cm2. What is an estimation of its side?
a) 20 cm
C) 14 cm
b) 10 cm
d 50 cm

14cm

Explanation:

s x s=area

s²=200cm²

s=14.1421356237cm

s=14cm

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.