Periodic Table

4. A substance made from two or more different types of atoms chemically joined is called a __________.
9. A particle in the nucleus with no charge is a __________.
11. The rows that run across the periodic table are called __________.
12. 10 more questions
13. shell The outermost energy level of an atom containing electrons is called the __________.
16. The first element on the periodic table is __________.
17. symbol The one- or two-letter abbreviation used to represent an element is called its __________.
21. The columns that run up and down the periodic table are called __________.
23. A substance made from only one type of atom is called an __________.
24. A vertical arrangement of elements in the periodic table is called a __________.
26. number Elements are arranged in the periodic table based on their atomic __________.
27. Elements found on the right side of the periodic table are generally classified as a __________.
28. The centre of an atom containing protons and neutrons is called the __________.
29. Two or more atoms joined together form a __________.

1. Elements found along the staircase line between metals and non-metals are called __________.
2. The number of protons in an atom is called its atomic __________.
3. levels The regions around the nucleus where electrons are found are called __________.
4. Protons have a positive electrical __________.
5. number The total number of protons and neutrons in an atom is called the __________.
6. The small particles that move around the nucleus are called __________.
7. mass The average mass of an atom of an element is shown as its __________.
8. Atoms are usually electrically __________ because they have equal numbers of protons and electrons.
10. gases The group containing elements with full outer electron shells is called the __________.
11. The number of occupied electron shells in an atom is shown by its __________ number.
14. A particle with a negative charge found outside the nucleus is an __________.
15. Electrons are arranged around the nucleus in energy __________.
18. Elements in the same group have the same number of __________ electrons.
19. Elements found on the left side of the periodic table are generally classified as a __________.
20. table The organised chart that displays all known elements is called the __________.
22. A particle in the nucleus with a positive charge is a __________.
25. Electrons have a __________ electrical charge.