Electronic Structure (OCR GCSE Chemistry A, Combined (Gateway Science Suite)): Flashcards
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What do electrons occupy in an atom?
What do electrons occupy in an atom?
Energy levels (also called shells or orbits)
Which energy level fills first?
Which energy level fills first?
Lowest (innermost) energy level
Max electrons in first energy level
Max electrons in first energy level
2
Max electrons in second energy level
Max electrons in second energy level
8
Max electrons in third energy level (elements 1-20)
Max electrons in third energy level (elements 1-20)
8
Electronic structure of sodium
Electronic structure of sodium
2,8,1
What does sodium's 2,8,1 represent?
What does sodium's 2,8,1 represent?
2 electrons in 1st level, 8 in 2nd, 1 in 3rd
Two ways to work out electronic structure
Two ways to work out electronic structure
Atomic number or position in periodic table
How many elements' electronic structures to know
How many elements' electronic structures to know
First 20 elements
Max electrons: 1st, 2nd, 3rd shells (elements 1-20)
Max electrons: 1st, 2nd, 3rd shells (elements 1-20)
2, 8, 8