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☆☆☆☆☆It tells you how much of a molecule is made up of each element. - APEX
A lone pair of electrons takes up space despite being very small. Lone pairs have a greater repulsive effect than bonding pairs. This is because there are already other forces needing to be taken into consideration with bond pairs.
So to summarize: Lone pair-lone pair repulsion > lone pair-bond pair repulsion > bond pair-bond pair repulsion. This makes the molecular geometry different.
The type of bond is determined by the difference in electrongativity of atoms
The same atoms can combine in more than one ratio.
The s orbital is lower in energy than the porbital.
Decomposition reaction
The ClF2+ ion is bent. (The VSEPR AXE notation is AX2E2 ). The ClF2- ion (AX2E3) is linear.
The valence electrons.
One S atom and four O atoms
1s22s22p63s23p64s23d5
In this reaction a change of bonds of the reactants occur: the general form is:
AB + CD = AD + BC
CaCO3 -> CaO + CO2
Potassium has the largest atomic radius.
