Chemistry > Final Exam Review > Chem 120) Chemistry Final Review: (All)
Chem 120) Chemistry Final Review:
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Know what is the atomic number, atomic mass, protons, neutrons and electrons Atomic number – is the number of protons in the nucleus of an atom of any element Atomic mass – is expressed in amu... ; is the wighted average Protons – are positively charged particles in the nucleus Neutron – are neutral, have no electrical charge Electrons – are negatively charged particles in the nucleus Atomic number = number of protons Atomic number – (minus) atomic mass = neutrons Describe the shapes of molecules H2S, CBr4, and PCl3 H2S – bent Number of bonded atoms: 2 Number of lone pairs: 2 Number of electron sets: 4 CBr4 – tetrahedral Number of bonded atoms: 4 Number of lone pairs: 0 Number of electron sets: 4 PCl3 – pyramidal Number of bonded atoms: 3 Number of lone pairs: 1 Number of electron sets: 4 [Show More]
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