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25-30

25. Which of the atoms listed below is the most electronegative? A) Li B) Cs C)P D) As E) Ge 26. The number of pi bonds in the molecule below is ?? ?? A) 2. B) 4. C) 6. D) 10. E) 15 27 Which of the following molecules have the same geometries? 28. Which of the following is a basic oxide? 29. Which of the following elements behaves chemically similarly to oxygen? 30 Lanthanide (or rare earth elements) have atoms or ions with partially filled A) SFa and CHs B) CO2 and H:O C) CO2 and Beh D) N20 and NO2 A) CO2 B) MgO C) As Os D) S02 E) Ch0 A) magnesium B) sodium C) sulfur D) chlorine E) iron F beryllium A) s subshells, B) p subshells. C) d subshells. D) fsubshells. E) g subshells. Formulas: All electromagnetic radiation: ? * v-c A quantum of energy: E-h*v E--RH/n2 n-1,2,3,. (for H atom) Energy of emitted photon- h v (-Ef-E) -h/mv Speed of light (c) in a vacuum -3.00 x 108 m/s Plancks constant (h)- 6.63 x 104J*s Ru (Rydberg constant)-2.18 x 10-18 J Formal charge- valence electrons on free atom- (number of lone- pairs electrons) (number of electrons in bonds)-
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