Question

what is electronic configuration? write the electronic configuration and valency of first 20 elements ( H to Ca ) ​

Answer 1

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In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom or molecule in atomic or molecular orbitals. For example, the electron configuration of the neon atom is 1s² 2s² 2p⁶, using the notation.

Valencies of first 20 elements:-

• Hydrogen=1
• helium=0
• lithium=1
• Beryllium=2
• Boron=3
• Carbon=4
• Nitrogen=3
• Oxygen=2
• Flourine=1
• Neon=0
• Sodium=1
• Magnesium=2
• Aluminium=3
• Silicon=4
• Phosphorus=3,5
• Sulphur=2
• Chlorine=1
• Argon=0
• Potassium=1
• Calcium=2

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