Video Transcript
What period of the periodic table
can the element marked X be found in?
Each row of the periodic table is
called a period. The atomic number of the elements
increases from left to right across a period. The outermost electrons in atoms of
elements within the same period are found in the same energy level. For example, hydrogen and helium
are found in the first row of the periodic table. The outermost electrons in these
atoms are found in the K energy level. Lithium, boron, and neon are found
in the second row of the periodic table. The outermost electrons in these
atoms are found in the L energy level.
The periods of the periodic table
are numbered one through seven from top to bottom. After numbering the rows of the
periodic table, we can see that the element marked X is found in row six.
Therefore, the element marked X can
be found in period six of the periodic table.
