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Here are answers to 2022-2023 Review Homework for Electron Configurations, Atomic Mass and Periodic Table
1) Fill completely with electrons the first subenergy (closest to nucleus therefore least amount of energy those electrons have)
2) Electrons. The way we says it is maximum 2 electrons in each orbital.
3) Electrons are filled into each orbitals (also called degenerate) before any orbital can have two electrons in it.
4) 3 subenergy levels ("s", "p", and "d") subenergy level.
5) There are 5 "d" orbitals in each "d" subenergy level
6) Since there are two different types of subenergy levels, s brings 2 electrons and p orbital brings 6 for a total of 8electrons.
7) No since in third energy level there are 3 different subenergy levels (s, p, d) therefore
8) atoms of the same element different by mass (# of mass). Carbon-13, C-13, 136C.
9) #n= Mass number - Atomic number
10) Atomic Number
11) Electron in the highest energy level. Column column L to R not including "d" & "f" blocks.
1) ( As 33e-) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 [5 valence electron]
2) (Bi 83e-) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p3 [5 valence electron]
3) (Cs 55e-) 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s1 [1 valence electron]
Part II (2nd one)
Note: p+ - proton, e- - electron, n0 - neutrons
a) Ca-42 (Calcium-42), 20p+, 20e-, 22n0
b) C-13 (Carbon-13), 6p+, 6e-, 7n0
c) U-238 (Uranium-238), 92p+, 92e-, 146n0
See Atomic mass table for actual atomic mass.