To determine how atoms might bond, i found it helpful to;
In the periodic table, elements are classified into groups and periods. The chemical properties of the atoms of an element depends on the group to which the element belongs.
The number of electrons on the outermost shell of bonding atoms tell us whether the bond between them will be ionic or covalent. For instance, an atom having only two outermost electrons will form an ionic bond with an atom having seven outermost electrons. An atom having four outermost electrons will form a covalent bond with another atom having four outermost electrons and so on.
Atoms that have a little electronegativity difference between them usually form a covalent bond. As the magnitude of difference between the electronegativity of the atoms increases, a polar covalent bond may be formed between the atoms. A very large electronegativity difference leads to the formation of an ionic bond between two atoms.
The ionization energy of atoms shows the ease with which the atoms loose electrons while the electron affinity shows the ease with which atoms gain electrons.
An atom with high electron affinity (low ionization energy) will form an electrovalent bond with an atom that has a low ionization energy.
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