TRC NGHIM CHNG I: CU TO NGUYN T Cu 1: Mt nguyn t thuc nhom VIIA co tng s proton, ntron va electron trong

nguyn t bng 28. Cu hinh electron cua nguyn t o la: a. 1s22s22p63s23p5 b. 1s22s22p5 c. 1s22s22p63s23p6 d. 1s22s22p6 Cu 2: Nguyn t X c tng s ht proton, notron, electron l 34. Bit s ntron nhiu hn s proton l 1. S khi ca X l: a. 11 b. 19 c. 21 d. 23 Cu 3: Mnh no sau y khng ng? a. Ch c ht nhn nguyn t oxi c 8 proton b. Ch c ht nhn nguyn t oxi c 8 notron c. Ch c trong nguyn t oxi mi c 8 proton d. Ch c oxi mi c s hiu nguyn t l 8 Cu 4: Nguyn t X c cu hnh kt thc 3s1 .Tm Z ca nguyn t X A. 11 B. 21 C. 20 D. Tt c u ng Cu 5: Cho cu hnh ca cc nguyn t: 1. 1s22s22p63s2 2.1s22s22p5 3.1s22s22p63s23p6 4.1s22s22p63s23p64s2 Xc nh nguyn t kim loi: A. 1,3 B. 1,2 C. 1,2,3,4 D. Kt qu khc Xc nh nguyn t phi kim : A. 4 B. 1,2 C.1,2,3,4 D. 2 1 Cu 6: Cu hnh nguyn t kt thc 4s . S hiu nguyn t ca nguyn t l : A. 19 B. 24 C. 29 D. A, B, C u ng. Cu 7: Cho k hiu : 65 Y 29 S ht p, n, e trong nguyn t Y ln lt l : A. 29, 36, 29 B. 36, 29, 29 C. 29, 29, 36 D. p n khc. 24 -27 Cu 8: Khi lng Mg l 39,8271.10 kg v theo nh ngha 1u =1,6605 .10 27 kg . Tnh khi lng 24Mg theo u. A. 23,985u B. 66,133.10-51u C.24,000u D.23,985.10-3u Cu 9: Trng hp no di y c s ph hp gia k hiu nguyn t v s ht c bn? Proton Notron Electron A. 12 11 1223 11

Na

B.35 17

17Cl

35

17

C.42 20

20Ca

22 34

20 29-

D.63 29

29+Cu

Cu 10: Dy no di y gm cc ng v? A. 14 X , 147 Y B. 19 X , 20 Y 6 9 1040 19

C.

28 14

X,

29 14

Y

D.

40 18

X,

Y

Cu 11: Trong t nhin Gali c 2 ng v l 69Ga (60,1%) v 71Ga (39,9%). Khi lng trung bnh ca Gali l: A. 70 B.71,20 C. 70,2 D. 69,8 Cu 12: Cu hnh ng ca nguyn t c Z= 29 l: A. 1s22s22p63s23p6 4s23d9 B. 1s22s22p63s23p6 3d94s2 2 2 6 2 6 9 2 6 3 C. 1s 2s 2p 3s 3p 3d 4s 4p 3d D. 1s22s22p63s23p6 3d104s1 Cu 13: Nguyn t ca mt nguyn t R c lp ngoi cng l lp M, trn lp M cha 2 electron. Cu hnh electron ca R v tnh cht ca R: A.1s22s22p63s2, kim loi B. 1s22s22p63s23p6, kh him 2 2 6 2 2 C. A.1s 2s 2p 3s 3p , phi kim D. 1s22s22p63s2, phi kim Cu 14: Nguyn t ca mt nguyn t c in tch ht nhn l 13+. S electron lp ngoi cng ca nguyn t l bao nhiu? A. 13 electron B. 3 electron C. 5 electron D. 14 electron Cu 15: Cho bit cu hnh electron ca X, Y ln lt l: 1s22s22p63s23p3 v 1s22s22p63s23p64s2 . Nhn xt no sau y l ng ? A. X v Y u l cc kim loi B. X v Y l cc phi kim C. X v Y l cc kh him D. X l phi kim cn Y l kim loi Cu 16: iu khng nh no sau y l khng ng: A. S proton trong nguyn t bng s hiu nguyn t. B. S proton trong ht nhn bng s electron lp v nguyn t. C. Ch c ht nhn nguyn t oxi mi c 8 proton. D. Ch c ht nhn nguyn t oxi mi c t l s proton v ntron l 1:1. Cu 17: Tng s ht ( p, n, e ) trong nguyn t ca mt nguyn t l 28. 1. S khi A ca ht nhn l : A.17 B.18 C . 19 D . 20 2. Cu hnh electron nguyn t ca nguyn t l: A . 1s22s22p3 B.1s22s22p5 C.1s22s22p6 D.1s22s22p1 Cu 18: Nguyn t R c cu hnh electron lp ngoi cng l 4s24p5. in tch ht nhn ca nguyn t R l: A. 20 B. 35 C. 45 D. 20 6 3 C , 65 C (chim 27% s nguyn t). Hi 0,5 u u Cu 19: ng c 2 ng v l mol Cu c khi lng bao nhiu? A. 31,77g B. 32g C. 31,5g D. 32,5g

Cu 20: Trong t nhin ng c 2 ng v l 63Cu v 65Cu. Nguyn t khi trung bnh ca ng l 63,54. Thnh phn phn trm v khi lng ca 63Cu trong CuCl2 l: A. 31,34% B. 31,43% C. 36,35% D. Tt c u sai Cu 21: S electron ti a ca lp O (n = 5) l: A. 12e B. 18e C. 32e D. 50e