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Elements Page
Table of Elements
Use the table to answer the questions.
Element Symbol Number of Protons
(Atomic #)
Number of Electrons Number of Neutrons
(most stable isotope)
Atomic Mass
(most stable isotope)
Type of Element
Hydrogen H 1 1 0 1 non-metal
Helium He 2 2 2 4 noble gas
Lithium Li 3 3 4 7 alkali metal
Carbon C 6 6 6 12 non-metal
Oxygen O 8 8 8 16 non-metal
Silicon Si 14 14 14 28 metalloid
Chlorine Cl 17 17 18 35 halogen
Calcium Ca 20 20 20 40 alkaline earth metal
Manganese Mn 25 25 30 55 transition metal
Iron Fe 26 26 30 56 transition metal
Lead Pb 82 82 125 207 post-transition metal
Gold Au 79 79 118 197 transition metal

1. What is the chemical symbols for iron, lead, and gold? _____________________________

2. Which element has the fewest protons? _____________________________

3. In this table, which element has the most neutrons? ___________________

4. Which element in this table is a noble gas? _______________________

5. Which element has 26 protons? ___________________

6. Which elements have 30 neutrons? _____________________________

7. The atomic number (# of protons) uniquely determines an element. Does the number of neutrons determine an element? _____________________________

8. A proton has a positive charge; an electron has a negative charge. The number of protons and the number of

_____________________________ is the same (this gives the atom a neutral charge).

9. How many protons plus neutrons does chlorine have? _____________________________

10. The protons and neutrons are located in the nucleus of an atom; tiny electrons surround the nucleus. Atomic mass is essentially the weight of the atomic nucleus; it is the number of protons plus the number of _____________________________.

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