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The Periodic Table - Answers
1. Who first devised the Periodic Table as we know it today?
Dmitri Mendeleev.
2. When was the periodic table as we know it today devised?
1869
3. Which element has the atomic number 1?
Hydrogen.
4. What is the Atomic Number?
The number of protons in the nucleus of an element.
5. What are the horizontal rows of the Periodic Table called?
Periods.
6. Which element has the atomic symbol K?
Potassium.
7. Name the Noble [Inert] gases?
Helium, Argon, Radon, Krypton, Xenon & Neon.
8. What is the chemical symbol for Tungsten?
W'.
9. Which metallic element, atomic number 50 , has the symbol Sn?
Tin.
10. Which chemist discovered amongst others, Potassium , Sodium and Strontium?
Sir Humphrey Davy.
11. Which group on the Periodic Table contains the elements Chlorine , Bromine and Iodine?
The Halogens (group 17).
12. What are the block of elements in Groups 3 to 12 of the Periodic Table commonly known?
The Transition Metals.
13. What is the chemical symbol for Gold?
Au.
14. What do all the elements in a group on the Periodic Table share , leading them to have common properties?
The same number of outer electrons.
15. What is the total number of elements in the periodic table?
118
16. How many of the elements on the Periodic Table occur naturally?
92 (although there is some debate and answers vary between 88 and 94.)
17. Of which Group on the Periodic Table is Sodium a member?
The Alkali Metals (Group 1).
18. Which element , atomic number 14 is the second most abundant on Earth?
Silicon.
19. Alphabetically which is the first element in the Periodic Table?
Actinium (Ac , Atomic No. 89).
20. Alphabetically which is the last element in the Periodic Table?
Zirconium (Zr, 40).