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Elements of the Periodic Table Answers

Page history last edited by Nancy Weber 3 years, 9 months ago

17. He used common characteristics of the elements to sort them into groups.  

He then noticed that there was a pattern in their atomic weights.

18. Mg

19. Carbon

20. Period 1

21. Group 16

22. For a and b, elements with similar characteristics will be those that are located in the same group:

Fluorine – Chlorine, Bromine, Iodine and Astatine

Oxygen – Sulfur, Selenium, Tellurium and Polonium



23.  The modern Periodic Table of Elements is arranged according to Atomic Number (the number of protons in one atom) 


Atomic # = 2

Element Symbol = He

Atomic Mass = 4

Number of Protons = 2

Period = 1

Group = 18

Number of Electrons in Outer Shell = 2 (There are 2 Protons, therefore there are only 2 Electrons.  Every other element in Group 18 has 8 Outer Electrons)

25) 52 Protons

26) Terbium

27) Iodine; Iodine has an atomic number of 53 and Nickel has an atomic number of 28.  This means that Iodine has 53 protons and Nickel has 28.

28) Tungsten

29) Period 5

30) Group 18

31) Same as for #24

Potassium – Hydrogen, Lithium, Sodium, Rubidium, Caesium and Francium 

Krypton – Helium, Neon, Argon, Xenon and Radon

Strontium – Beryllium, Magnesium, Calcium, Barium and Radium

Gold – Copper and Silver


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