The Periodic Table

Complete the following description of the periodic table by filling in the missing words.

In the modern periodic table, elements are listed by increasing (1) _____. Each box represents an (2) _____. A box contains the name, atomic number, (3) _____, and (4) _____ for the element.
Vertical columns in the table are called (5) _____. Most elements in a column have the same number of (6) _____ in the outer energy level and tend to have similar (7) _____.
Horizontal rows in the table are called (8) _____. The elements on the left side of the table are (9) _____. Groups 3-12 contain metals known as (10) _____. Elements on the right side are (11) _____.