Ten. What might those codes be for and why Sta
Why do earthquakes occur
18. An architect is hired to design a skyscraper in
the Indonesian city of Jakarta, which is near
the Ring of Fire. The architect must follow
special building codes that the city has writ-
more often in some places
APPLY
akes
ke risk the
Muli
than in others?
Circ
1. I
es
tes
am indi-
se
are they important in Jakarta?

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.