Chemistry – Atoms, elements and compounds - Atomic structure and the Periodic Table | e-Consult
Atoms, elements and compounds - Atomic structure and the Periodic Table (1 questions)
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(a) Potassium (K):
Potassium has an atomic number of 19. Its electronic configuration is:
- 1s2 2s2 2p6 3s2 3p6 4s1
In shorthand notation, this is written as [Ar] 4s1.
(b) Calcium (Ca):
Calcium has an atomic number of 20. Its electronic configuration is:
- 1s2 2s2 2p6 3s2 3p6 4s2
In shorthand notation, this is written as [He] 4s2.