how can you predict the electron configuration of atoms using the periodic table as a model?

Use the periodic table to identify atom properties such as groups and electron configurations. Elements are organized by period and group, with the period corresponding to the principle energy level, and the group relating to the extent the subshells are filled.

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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