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Sidana [21]
3 years ago
14

Stable electron configurations are likely to contain ____.

Chemistry
2 answers:
Serjik [45]3 years ago
7 0

1. B.  Orbital Shape

2. C.  counterclockwise

3. D.  Electrons enter orbitals of lowest energy first

4. C. 6

5. C. 2

6. A. Filled energy sublevels

luda_lava [24]3 years ago
3 0

filled energy sub levels. i took test and got it correct

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Write the symbol for every chemical element that has atomic number greater than 55 and atomic mass less than 144.0 u
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You will need a periodic table to help you answer this problem. The atomic numbers are arrange from lowest to highest in the periodic table. You can locate element number 55 to be Cesium with an atomic weight of 132.905 amu. So, you start from element 56. The following elements are:

56     Barium       137.328 amu
57     Lanthanium   138.905 amu
58     Cerium       140.116 amu
59     <span>Praseodymium    140.908 amu
60     Neodymium   144.243 amu

Neodymium is already greater than 144 amu. Therefore, these elements only include Barium, Lanthanium, Cerium and Praseodymium.</span>
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Generally speaking, elements with high electronegativities are 1. nonmetals. 2. likely to form anions (except the noble gases).
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Answer:

1. Nonmetals.  

2. Likely to form anions (except the noble gases).  

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Elements with high electronegativities are found towards the upper right corner of the Periodic Table. Thus, they have all the above properties.

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