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5.1. p=54 n=77 e=54
5.2. p=9 n=10 e=9
5.3. p=34 n=45 e=34
6.1. [tex] 1s^22s^22p^63s^2 [/tex]  (3,0,0,-1/2)
6.2. [tex] 1s^22s^22p^63s^23p^4 [/tex] (3,1,-1,-1/2)
7.1. Na2SO4 = 23x2 + 32 + 16x4 = 142g/mol
7.2. NaOH = 23 + 16 + 1 = 40g/mol
8. [tex] 1s^22s^22p^63s^23p^64s^1 [/tex] periode 4 gol 1A
9. [tex] Mg (s)+ 2 HCl (aq)-> MgCl_2 (aq) + H_2 (g) [/tex]

5. a) Proton= 54, neutron= 77, elektron= 54
b) Proton= 9, neutron= 10, elektron= 9
c) Proton= 34, neutron= 45, elektron= 34

7. b) NaOh = 23+16+1=40g
8. 1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^1
= terletak pada golongan= 1 A
periode = 4
ev= 1

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