An element with the following electronic configuration: [Ar]3d3 4s2 a) what. Does it belong to? Period 4 b) what is its group number? Group 5 c) what kind of element is it? Transition metal d) how many of how electrons are there in an atom of this element? 3 2. what atom has this electronic configuration? 1s2 2s2 2p6 3s2 3p1 Aluminum Al 3. which of the following atoms or ions are diamagnetic? Br3+ S C F- Cr2+ F- b) which of the following ions or atoms are paramagnetic? As Zn Mg2+ C2+ Mn4+ Mn4+ 4. which following elements has +3 ion with 2 unpaired electrons? As Cl Fe Sc Cr 5. use periodic trends and predict which of the following elements has the largest first ionization energy Sr Cl Cs Br Cs<Sr<Br<Cl 6. use periodic trends to predict which of the following elements has the largest atomic radius S Ar He Ge 7. use periodic trends and predict which of the following items has the largest radius N3- F- Mg2+ O2- 8. use a noble-gas notation and write the ground-state electronic configuration of the following ions: Cs+ Ge2+ Cu2+ 9. write the equation representing the second ionization energy for Mn [Ar]3d5 b) the electron affinity of Br is 325 kJ/mol Write the equation for which this is the energy change 10. each of the following oxides reacts with water to produce an acid or a base, depending on whether the oxide is an acidic or basic oxide. Give the formula of the products of this reaction. SrO B2O3 Br2O5 everything in red is answered and the rest i need help with, someone please help me thanks !