Part D. Which of the following is not an element?
The periodic table is a list of elements arranged by atomic number. As you can see in the image below, the atomic number for each element is the whole number in the cell. The atomic mass, written below the symbol here although it may appear elsewhere in some periodic tables, is the average mass of the isotopes of that element.
Groups and periods
Columns in the periodic table are called groups, and the rows are called periods. Notice that the groups are labeled 1 to 18 and the periods are labeled 1 to 7. Groups 1, 2, and 13 to 18 are called the main group elements, groups 3 to 12 are the transition elements, and the bottom two rows are called the lanthanides and actinides, respectively.
This table gives properties and alternate names for some of the groups:
Metals vs. nonmetals
Notice the heavy zigzag line running diagonally across the right part of the table. This line separates metals (below and to the left of the line) from the nonmetals (above and to the right of the line). Metals tend to lose electrons to form positive ions, whereas nonmetals tend to gain electrons to form negative ions.
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