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Chemical Bonding

Across
When the elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties. (2)
The force of attraction that holds metals together; it consists of the attraction of free-floating valence electrons for positively charged metal ions. (2)
Atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas, usually eight valence electrons. (2)
A neutral group of atoms joined together by covalent bonds. (1).
An element in group 8A of the periodic table; the S and P sublevels of the highest occupied energy level are filled. (3)
The rule that electrons occupy the orbitals of lowest energy first. (2)
A bond formed by the sharing of electrons between atoms. (1)
The ability of an atom to attract elements when the atom is in a compound. (1)
Down
An atomic orbital may describe at most two electrons, each with opposite spin direction. (3)
Electrons occupy orbitals of the same energy in way that makes the number or electrons with the same spin direction as large as possible. (2)
An atom, ion, or molecule with an electron in a higher than normal energy level than its ground state. (2)
The lowest possible energy of an atom described by quantum mechanics. (2)
The electrostatic attraction that binds oppositely charged ions together. (1)