Write one paragraph about why we have the periodic table, who is responsible for creating it, and why it is important to us all.

help me please? :)

The periodic table is very important. Invented on February 17, 1869, by Dmitri Mendeleev. The periodic table is important because it organizes and shows different elements and the number of atoms. This has benifited our science community immensely

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer