Help Session on Standard MNRG.5.a (GA Chemistry)

This standard is really easy to master, if you know the basic layout of the periodic table.  There is a stairstep-looking boundary that divides the periodic table into its two main parts.  It starts below boron (B) and jogs down underneath silicon (Si), arsenic (As) and tellurium (Te).  Every element that touches this line, except aluminum (Al) is a metalloid (also called a semimetal).  To the right of the boundary are the nonmetals.  Hydrogen looks like it’s on the left, but it is actually also a nonmetal.  To the left of the boundary are the metals, including the two rows on the bottom of the table that start with Ce and Th:

image of periodic table with metal-nonmetal boundary

The blue boundary divides the periodic table into metals (purple zone), nonmetals (green zone) and metalloids (touching the boundary).

 

 

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