1. Write the complete electron configuration for each atom on the blank line. Lithium Fluorine Carbon Argon Sulfur Nickel Rubidium Xeon 2. What elements are represented by each of the following electron configurations? a. 1s2 2s2 2p5 b. 1s2 2s2 2p6 3s2 3p6 4s2 c. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p65s2 4d10 5p4 d. 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p5

Explanation:

Answer 1:

Lithium : 1s2 2s1  Fluorine: 1s2 2s2 2p5   Carbon: 1s2 2s2 2p2

Argon : 1s2 2s2 2p6 3s2 3p6   Sulphur: 1s2 2s2 2p6 3s2 3p4

Nickel: 1s2 2s2 2p6 3s2 3p6 3d8 4s2  Rubidium: 1s2 2s2 2p6 3s2 3p6 3d10  4s2 4p6 5s1   Xenon: 1s2 2s2 2p6 3s2 3p6 3d10  4s2 4p6 4d10 5s2 5p6

Answer 2:  A. Fluorine B. Calcium  

C. It is Tellurium if this was the exact electronic configuration 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p4 you intend to write, if not, no element has such electonic configuration.

D. Bromine but the correct electronic configuration is 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p5

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

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