4. Determine the group, period, and block of the elements having the following electron configurations. a. 1s? b. [Ne]3s 3p'. c. [Ar]4s'. d. [Kr]5s24d'. e. [Xe]6s²4f"5d®6p .

1. How can you know that an electron can be quantizied? ENERGY NEEDED TO REMOVE ELECTRONS 1-8 FROM ALUMINUM 2ND BRD TH STH STH ELECTRON REMOVED -ENEROY NERDED TO REMOVE AN CTRON K 2. How do we know that this is the lonization energy of Aluminum? Where is the biggest difference in energy, so how many valence electrons does Al have and in what orbitals are they in? 3. If element 120 was discovered and given the name Hemandizium. Correctly write the Noble gas configuration of this element and state what group and properties this element should posses? (metal or nonmetal, atomic radii is large or small, how many valence electrons would it have? ete) 4. Compare and contrast the atomic sizes of Magnesium and Argon.

Write electron configurations consistent with the following data on numbers of unpaired electrons. a. Ni+2, 2 unpaired electrons b. Cu+2, 1 unpaired electron c. Cr+3, 3 unpaired electrons

Give the symbol of the element that has this orbital diagram. NNNN NNNN NN 3s 3p 4s 3d 1s 2s 2p * Previous esc @ 23 2 3 5 W E R tab A D F G s lock %24