Photo Credits:
Freeman, S. (2002). Water and Carbon: The Chemical Basis of Life. In Biological Science (4th ed., pp. 15-37). San Francisco, CA: Pearson Benjamin Cummings.
Atomic number is the number of protons in the atom
Atomic mass is the total weight of the atom (the number of protons + number of neutrons)
Neutrons
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No charge
Atomic mass is the total weight of the atom (number of protons + number of neutrons)
Nucleus
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Center of the atom that contains protons & neutrons
Orbital
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Space where electrons reside
Innermost shell holds up to 2 electrons, any shell beyond that can hold up to 8
The outermost shell is known as the valence shell
How they interact
Electron sharing bonds
Covalent bond
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Electrons can be shared equally or unequally depending on an atom's electronegativity
Strongest bond
Oxygen has the highest electronegativity, followed by nitrogen, with carbon and hydrogen being the least electronegative respectively.
Polar
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Electrons are shared unequally
Nonpolar
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Electrons are shared equally
Bonds due to attraction of charge
Ionic bonds
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Two ionic atoms interacting
Strongest charge based bond
Hydrogen bonds
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When hydrogen is in a polar covalent bond, it becomes lightly charged. This partial positive charged end on hydrogen interacts with a negatively charged atom to form a hydrogen bond
Vanderwaal's interactions
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Electrons end up stacked on one side of an atom, resulting in a quick & temporary charge
Variations
Ions
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Gain or loss of electrons that forms a charged atom
Cation
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Positive charge
Anion
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Negative charge
Isotope
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Alteration in the number of neutrons in the nucleus that makes the nucleus unstable