Question

Q18. Which of the following electron configurations corresponds to the ground state of an atom of a transition element? A) 1s22s22p 3s23p 4s%3d B) 1s22s22p%3s 3p43d4 C) 1s22s22p 3s 3p64523 D) 1s22s22p 3s 3p%3d1045-4p) E) 1s22s2p 3s23p%3d"45²4p3 Q20. Particle A moves three times faster than particle B, calculate the mass ratio of particle A to particle B, if both have the same de Broglie wavelength. A) 0.33 B) 3.0 C) 0.66 D) 0.25 E) 0.75 Q21. Which ground-state electron configuration is incorrect? A) Ni: [Ar]3d B) Mg: 1s 2s22p 3s? C) Co: [A]4s 3d' D) K:[Ar]4s E) Br: [Ar]3d104s24p

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Answer 1

Solution=

solution it ® Ans ② ② 18²2s²2p6 as ²3p6 45² 3d ² (trensition element) In the given electronic contiguration, the adomic number of the atom is 22. If is a d-block. eleoment because the valance electron is in d-shell. The name of the atom is Titonium (Ti) ® 15²25²2pb 33² 3p6 3d 4 x The electronic corong. This is because 3d orbital before the full killed 45 orbitale s contiguration is con't bill to @ In this contigwention, the 30 f -orbital so the element, and not electron atom it killed in to block 0 killed p-block In these contiguration, last electron in p-orbital so the atoms is element. 20 According to de-Broglie equation - where a wavelength h 7 planeks's constant my mass of the particle. V > velocity of light A moves since 30 particle BA=3B 3 times kaster than B. for A, fare o 2 h p = h 0 0 mBV

WA 31 The atomic no ok Ni is 28 (15533 45 3 ) ar [Ar] 45² sd 8. so the incorrect electrenie consiguention is