Select the valance structure of the transition metal a. 1s^1 2s^1 2p^0 3s^1 b. 1

Question

Select the valance structure of the transition metal a. 1s^1 2s^1 2p^0 3s^1 b. 1s^12s^22p^63s^23p^63d^24s^2 c. 1s^12s^12p^63s^23p^63d^104s^24p^6 d. 1S^12s^22p^63s^23p^64s^2 9) For a BCC crystal, atoms are touching along which direction? a. [100] b. [110] c. [111] d. [200] 10) In a FCC crystal, which plane has the highest planar density (PD)? a. (100) b. (110) c. (111) d. (211) 11) The lattice parameter relationships of a = b = c and alpha = beta = gamma= 90degreerefers to which crystal system? a. Cubic b. Hexagonal c. Tetragonal d. Monodinic 12) An example of a line defect would be a. Dislocation b. Grain boundaryc. Vacancy d. Twin 13) Hardness refers to the ability of a material to a. Absorb energy b. Resist deformation by indentation c. Cary high loads d. Work harden 14) Materials with high toughness often have a. Low ductility and high strength b. High strength and ductility c. High yield and low tensile strength d. Ionic bonding 15) A material that lacks long-range periodic order is called a. Polymorph b. Isotropic c. Amorphous d. Ceramic 16) Very electronegative atoms (CI) are most likely to A. attract an extra electron B. give up a valence electron C. form metallic bonds D. none of the above

Explanation / Answer

8 - d

9 - c

10 - a

11 - a

12 - a

13 - b

14 - b

15 - c

16 - d (i think. because it wont attract extra electron. just attract already paired electron towards it. b and c are not.)

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