Chemistry Reference
In-Depth Information
_____4. A space that can be occupied by up to two electrons.
_____5. This type of ion is formed when an atom loses some electrons.
_____6. Each electron is described by a set of four of these.
_____7. This number is equal to the number of protons in an atom.
_____8. This type of ion is formed when an atom gains additional
electrons.
_____9. A positively charged particle found in the nucleus of an atom.
Part II—Elemental Notation
Base your answers to questions 10-15 on the following elemental
notation.
+
3
1
H
10. Which element is represented by this elemental notation?
11. What is the atomic number of the element?
12. What is the mass number of the element?
13. How many protons does the element have?
14. How many neutrons does the element have?
15. How many electrons does the element have?
Part III—Electron Configuration
Base your answers to questions 16-20 on the following electron con-
figurations of neutral atoms.
a. 1s
2
2s
2
2p
6
3s
1
c. 1s
2
e. 1s
2
2s
2
2p
5
b. 1s
2
2s
2
2p
2
f. 1s
2
2s
2
2p
4
16. Which electron configuration represents a noble gas?
d. 1s
2
2s
1
2p
3
17. Which electron configuration shows an atom in the excited state?
18. Which electron configuration shows an alkali metal?
19. Which electron configuration represents a halogen?
20. Which ground state configuration shows a total of 4 valence electrons?
