Periodic table crossword puzzle

2. The element in Group 1 and Period 4 is ______.
5. table The table that lists all known elements in order of increasing atomic number.
6. The lanthanides and actinides are shown separately from the main table because they form extra ______.
10. line has **the answer**, followed by a **space**, then the **clue**:
12. The smallest unit of an element that retains its properties.
15. Elements in the same group have similar chemical ______.
17. A substance made up of only one type of atom.
19. The arrangement of electrons in shells is called electron ______.
21. Here’s the crossword clue list formatted exactly as you requested —
22. The elements arranged by proton number and properties create repeating ______.
23. There are a total of ___ groups in the periodic table.

1. Horizontal rows in the periodic table are called ______.
2. The rows of elements showing repeating patterns are called ______ trends.
3. The element carbon (C) is in Group 14 and Period __.
4. Elements that have properties between metals and non-metals are called ______.
7. The elements on the left and center of the periodic table are mostly ______.
8. gases The group containing helium and neon is called the ______ gases.
9. number The number of protons in an atom (also called proton number).
11. The group containing fluorine and chlorine is called the ______ group.
13. Elements that are gases at room temperature include oxygen and ______.
14. The table is arranged by increasing ______ number.
16. Any characteristic that describes an element is called a ______.
18. Elements such as H₂, N₂, O₂, and Cl₂ exist naturally as ______ molecules.
20. The right-side elements of the periodic table (except hydrogen) are mostly ______.
21. There are ___ periods in the periodic table.
24. Vertical columns in the periodic table are called ______.
25. The element magnesium (Mg) is found in Group 2 and Period __.