)of22 22. The atomic radius decreases from left to right acrossa period on the p
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)of22 22. The atomic radius decreases from left to right acrossa period on the periodic table because (A) the effective nuclear charge increases attracting the (B) the electrons begin to be paired within the valence (C) the electrons end up occupying core orbitals, which (D) the nucleus begins to shrink as the number of Which ion has the largest radius? valence electrons more strongly orbitals. 4d are smaller protons increases 23. (A)F (B) Mg (C) Na (D)O 24, which third perod -lonization Energy/kJ-mor element has the successive ionization energies (IE) given in this table? IE(I) IE(2) IE(3) 578 1817 2745 11577 (A) AI (B) Mg(C) Na (D) Si Which atom has the largest first ionization energy? (A) Mg (B) S (C) Si (D) S 25. How many nonbonding pairs of electrons are on the central atom in BrF? 26. (A) (B)1 (C2 (D) 3 Which species is not planar? (A) BF, (B) CH (C) PF (D) NO 27. 28. What is the molecular geometry of the CIF ion? (B) square planar (D) tetrahedral (A) seesaw (C) square pyramidal 29. Which molecule has a tetrahedral geometry about the central atom? (A) SiF(B) PF (C) SF (D)XeF 30. According to the VSEPR method, what are the approximate values of the bondC- angles X and Y? (A) X is 90° and Y is 90° (B) X is 90° and Y is 109.5 (C) X is 109.50 and Y is 90 (D) X is 109.5° and Y is 109.5Explanation / Answer
22. In a period left to right nuclear charge is increases over the valency electrons
So atomic radius is decreases from left to right in a period.
A. the effective nuclear charge increases attracting the valence electrons more strongly.
23.D. O^2-
24.C. Na
25. A. Mg
26.C.2
27. C.PF3
28. c. square pyramidal
29.A.SiF4
30.C. X is 109.5^0 and Y is 109.5^0
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