Question

Which of the following electron configurations is correct for nickel (atomic number 28)? *

(a) 1s²2s²2p⁶3s²3p⁶4s²3d⁸

(b) 1s²2s²2p⁶3s²3p⁶4s¹3d⁹

(c) 1s²2s²2p⁶3s²3p⁶4s²4d⁸

(d) 1s²2s²2p⁶3s²3p⁶4s⁰4d¹⁰

Q 7. What is the maximum number of electrons in a shell? *

(a) n²

(b) 2n

(c) n²

(d) 2n²

Q 8. Which of the following remains constant while moving down the group of the periodic table? *

(a) Atomic radius

(b) Metallic character

(c) Number of shells in the atom

(d) Valence electrons

Q 9. An element X from group 2 of the Periodic Table reacts with Y from group 17 to form a compound. Give the formula of the compound. *

(a) XY₂

(b) XY

(c) X₂Y

(d) (XY)₂

Q 10. The structure of IF₇ is *

(a) Octahedral

(b) Trigonal bipyramid

(c) Square pyramid

(d) Pentagonal bipyramid​

Answer 1

Answer:- 6-(a)
7-(d)
8-(d)
10-(d)