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☆☆☆☆☆A covalent bond between 2 atoms where each atom contributes 3 electrons
Apex :3
1s 2 2s 2 2p6 3s2 3p6 4s2
or
Ar 4s2 (Noble gas form)
In noble gas form, you go back to the noble gas (the last group on the periodic table) prior to the element you are writing the configuration for. The electron configuration is the same up until that point. Then you write down the difference.
In this example, the electron configuration for Argon (Ar) is 1s2 2s2 2p6 3s2 3p6. If you fill up the shells until 4s2, you get calcium. It's faster to abbreviate by saying "Ar 4s2"
Four atoms bound to a central atom with no lone pairs
Electron pairs
The energy of the valence electrons is greater than the energy of the core electrons.
A polar covalent bond
Hold Polar molecules together
Helium has the highest first ionization energy and francium has the lowest first ionization energy.
question: which of the following elements is the smallest?
answer: chlorine (CI)
covalent bond
A chemical bond holds atoms together
