Flashcards
Organising the Elements
Cards in this deck (6)
- 1What is the structure of an atom?A = Valence (outer) shell
B = Nucleus (protons and neutrons)
C = Electrons
D = Protons
E = Neutron
F = Shells - 2Electrons are arranged in Energy Levels or Shells around the nucleus of an atom. There is a limit to how many electrons can fit into each shell.1st shell: 2
2nd shell: 8
3rd shell: 8
4th shell: 18 - 3Representing an atom:2 = Atomic Number
He = Atomic Symbol
Helium = Atomic name
4.002 = Atomic Mass (protons + neutrons)
- 4What's in this example of an atom:52 = Mass number (protons + neutrons)
Cr = Element symbol
24 = Atomic number
- 5Describe the pattern in shell structure across a period (row)All elements in the same period have the same number of shells ( e.g., period 2 elements have 2 shells)
- 6Describe the pattern in valence electrons in a group (column)All elements in the same group have the same number of valence (outer) shells (e.g., group 2 elements have 2 valence electrons in their outer shell)