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CL4 questions
Bonding
Question | Answer |
---|---|
How do you find the number of valence electrons? | Look at its group number. |
How are cations formed? | When an atom loses one or more valence electrons. |
How are anions formed? | When an atom gains one or more valence electrons. |
What is the electrical charge of an ionic compound? | electrically neutral |
What are the properties of ionic compounds? | conduct electricity, electrostatic, melt at high boiling points |
How can you model the valence electrons of metal atoms? | As a sea of electrons. Valence electrons are mobile and can freely move from one part of the metal to another. |
Why are alloys important? | Their properties are often in larger portion ( superior) to their components elements |
What information does a molecular formula produce? | Shows how many atoms of each element a substance contains. |
What representative units define molecular and ionic compounds? | Molecule, formula unit |
What is the result of electron sharing in covalent bonds? | Atoms attain electron configurations of noble gases. |
What are some exceptions to the octet rule? | If number of valence electrons is an odd number. Molecules that have less or more than a complete octet. Atoms form double or triple covalent bonds if they can attain a noble gas by sharing two or three pairs of electrons. |
How are coordinate covalent bonds different from other covalent bonds? | In a coordinate covalent bond, the shared electron pair comes from one of the bonding atoms. |
How do electronegativity values determine the charge distribution in a polar bond? | The more electronegative atoms attracts electrons more strongly and gains a slightly negative charge. The less- electronegative atom has a slightly positive charge. |
How the strenghts of intermolecular attractions compare with the strengths of ionic and covalent bonds? | Intermolecular attractions are weaker than either ionic or covalent bonds. |
Why are the properties of covalent compounds diverse? | Widely varying intermolecular attractions. |