PDF chapter test TRY NOW
Fill in the blanks:
| atomic numbers | periods | seven | groups |
| first period | \(118\) | seven and eighteen | rows and columns |
| eighteen | two | hydrogen and helium | One and two |
| atomic masses | second period | three | hydrogen and oxygen |
1. In the modern periodic table, the vertical columns are termed __________.
2. In the modern periodic table, periods and groups indicate __________.
3. The elements __________ are an example of the first period of the modern periodic table.
Register for free to see more content