magnetic? 4)

Chromium, manganese, and barium are all examples of metals that can be prepared in a pure form by combining oxides of theses elements with reactive metals. When aluminum is chosen as the reactive metal, the process is referred to as the Goldschmidt process or the Thermite process. a.) What type of reaction is the Goldschmidt process? b.) Write the formulas for the common oxides formed by chromium, manganese, and barium. c.) Predict the products formed by each of the three oxides in the Goldschmidt process, using a balanced chemical equation.

21. Arrange the following elements in order of the size of their atomic radius: He, Na, P, Ca and Sr (a). Sr Ca> Na > P > He (b). He > Na > P > Ca > Sr (c). Sr > Ca> P > Na > He (d). He > P > Na > Ca > Sr (e). P > Ca Sr > Na > He

60. The water solution of a compound is green. The compound could be: a od odo T a) NazSO4 b) K2SO4 c) FeSO4 d) MgSO4 abanhe iol (s alabsMi ( odo ans dol 81. In the Periodic Table, The Transition Elements and the Rare Earth Elements are found in the: a) Odd numbered groups, only una mols nolnb 6 lo isbun ardt neowiod t ibooa o b) Even numbered groups, only c) Groups 3-12, only d) Groups 3-12, and the Lanthanide and Actinide Series, only my00t (s 82. In the ground state, how many electrons are in the outermost 2 sublevel of each element in the Halogen Group? a) 5 b) 2 c) 7 d) 8 viton le oPnob ibe pimcis bas zdesononi (d SToni zutben oimots has 25asoob 63. Magnesium has a smaller atomic radius than sodium because the magnesium atom has more: a) valence electrons b) energy levels c) protons d) neutrons

Shade four elements in the outline Periodic Table below. 1. The last element in the first transition series. 2. A rare-earth element. 3. A transuranic element. 4. An element in group 7B. H He Li Be BCN O F Ne BC Al Si P S Cl Ar Na Mg K Ca Sc Rb Sr Y Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb| Bi Po At Rn Fr Ra Ac Rf Db Sg Bh Hs Mt Ds Rg Cn Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr 5

Which group of the following in the periodic table is called transition metal? اختر احدى الدجابات O a. 1A b. 8A с. 6А O d. 2B

Shade four elements in the outline Periodic Table below. 1. The fifth d-block element. 2. One of the coinage metals. 3. The fourth lanthanide. 4. The second actinide. H Li Be Na Mg K Ca Sc Rb Sr Y Cs Ba La Fr Ra Ac He BCN O F Ne Al Si P S Cl Ar Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Rf Db Sg Bh Hs Mt Ds Rg Cn Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr OA X Ś

Which element in each period hasthe highest melting point? In eachcase, is the element you named atthe beginning, middle, or end of itsperiod?

8.Pick four elements in the main group (representative element) of the fourth period. a.Write its abbreviated electron configuration. b.Write the correct formula for its oxide. If it forms more than one oxide, you may list them all, but it is not necessary. If it does not form an oxide, state that. c.Is the most common ion the element forms larger or smaller than its neutral atom? Explain your answer in terms of electronic shells/subshells.

Question 4 The two Group VB elements niobium and tantalum have the same atomic radii. This is because of... O A. Lanthanide contraction; the filling of 4f orbitals through the lanthanide elements causing a steady increase in the effective nuclear charge. This contraction offsets the expected increase of second and third series of transition metals. B. Scandide contraction; the filling of 4f orbitals through the Scandide elements causing a steady increase in the effective nuclear charge. This contraction offsets the expected increase of second and third series of transition metals. O C. Lanthanide contraction; the filling of 4f orbitals through the lanthanide elements causing a steady decrease in the effective nuclear charge. This contraction offsets the expected increase of second and third series of transition metals. D. Scandide contraction; the filling of 4f orbitals through the Scandide elements causing a steady decrease in the effective nuclear charge. This contraction offsets the…