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Thời gian	Nội dung	Điểm cảm ơn
24/11/2021 07:09:31	a) Z=24: 1s2 2s2 2p6 ...	10
24/11/2021 07:08:30	Br(Z=35): 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 ...	10
24/11/2021 06:52:19	{23 + [1 + (3 – 1)2]} : 13= {23 + ...	5
24/11/2021 06:47:57	Z=24: 1s2 2s2 2p6 3s2 3p6 3d4 4s2Z=8: ...	10
24/11/2021 06:47:14	H (Z=1):1s1He(Z=2): 1s2Cl(Z=17): 1s2 2s2 ...	10
24/11/2021 06:46:37	Al(Z=13): 1s2 2s2 2p6 3s2 3p1Fe ( Z=26): ...	10
24/11/2021 06:43:32	x(x+2)-2x=> x^2 + 2x - 2x =0=> ...	7
24/11/2021 06:42:36	Na(Z=13): 1s2 2s2 2p6 3s1Ca(Z=20): 1s2 ...	10
24/11/2021 06:41:52	H2NCH(CH3)COOH + HCl -> ...	10
24/11/2021 06:36:05		10
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