C2.2.10 - Atomic Structure and The Periodic Table Flashcards
Who discovered argon?
Lord Rayleigh and William Ramsay
When was Argon discovered?
1894
What did Mendeleev at first think?
All elements should be able to react with each other
What 6 elements did Ramsay discover?
Helium Neon Argon Krypton Xenon Radon
What was different about the 6 elements Ramsay discovered?
They were all unreactive
What is the group of unreactive elements called?
Noble Gases Group 0 (IUPAC group 18)
What do you need to remember to understand the patterns of chemical properties in the Periodic Table?
Elements are arranged in order of increasing atomic number
The atomic number is the amount of protons in an atom
There are the same number of electrons and protons
The electronic structure of an element determines its chemical properties
Describe the elements in group 1
They are metals
They are very reactive
Their electronic structures end in 1
The ions formed in reactions are +1
Describe the elements in group 2
They are metals
They are reactive
Their electronic structures end in 2
The ions formed in a reaction are +2
Describe the elements in group 7
They are non-metal
They are very reactive
Their electronic structures end in 7
The ions formed in reactions are -1
Describe the elements in group 0
They are non-metal
They are unreactive
Their outer shells are full
They form no ions because they don’t react and they have full outer shells
