to) Transition etals within a perod diiler mainly in the anber of 10 all of the
ID: 694898 • Letter: T
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to) Transition etals within a perod diiler mainly in the anber of 10 all of the above 17) Consider the gneral valence electron configuration of no?nps and the following satement the 17) o Elements with this eletno (i0 Elements with this electron configuration are expected to have large in) Elements with this electren iv) Elements with this electron configuration form acidix oxides Which statements are true? A) ) i and (iai) B) (0 (ii) and (iv) C 0) and Gia) D) (ii) andail) E) All statements are true. 18) Which one of the following is not true about the alkali metals? A) They are low density solids at room temperature. B) They all readily form ions with a +l charge. C) They have the lowest first ionization energies of the elements D) They are very reactive elements E) They all have 2 electrons in their valence shells. 19) 19) All of the following are ionic compounds except B) K2O GsioD) NaO4 LiN A) NaC 20) 20) Which alkaline earth metal will not react with liquid water or with steam? A) Ca B) Be C) Ba D) Mg E) They all react with liquid water and with steam 21) 21) Which of the following has eight valence electrons? A) Na B) Kr D) Ti+ E) all of the aboveExplanation / Answer
1. Transition elements diifer mainly in the number of electrons present in d-orbital.
2.ns2 np5 is the configuration of a halogen.
Halogens tend to form ions having charge -1.
They have large negative electron gain affinities.
They form acidic oxides.
Halogens are obviously non-metals.
3.Alkali metals have one elctron in their valence shell unlike stated in the last option. All the other options are facts that state the properties of alkali metals.
4.SiO2 is the only non-ionic compound among the given options. It has a large covalent netwwork structure.
5.Beryllium has no reaction with water or steam even at red heat.
6. Na actually has one electron in its valence shell. But when it loses an electron the number of valence electrons become eight as its penultimate shell becomes its valence shell.
Kr has eight electrons in its valence shell.
Cl is one electron deficient from having eight valence electrons which it gains as it becomes Cl-
Ti has the configuration 4s2 3d2. When it becomes Ti4+ it loses the electronsfrom 4s and 3d orbitals and thus obtains 8 valence electrons.
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