Solve the following crossword puzzle by identifying the elements from the electronic configuration given for them.
Across
2.The element with electronic configuration 2,8,4.
4.The element whose uni negative anion has electronic configuration 2,8.
5.The element whose di negative anion has electronic configuration 2,8,8.
Down
1.The element with electronic configuration 2,8,8.
2.The element whose uni positive cation has electronic configuration 2,8.
3.The element whose di positive cation has electronic configuration 2,8,8.
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Solution
Across
2. Silicon
4. Fluorine
5. Sulphur
Down
Argon
Sodium
Calcium
Explanation
Across
2. Silicon has atomic number 14 and hence it has 14 electrons. Thus electronic configuration: 2,8,4.
4. Fluorine has atomic number 9. Hence it has 9 electrons. Uni negative anion means the atom has gained one electron. Now the total number of electrons=10. Thus the fluoride ion will have an electronic configuration:2,8.
5. Di negative anion means the atom has gained two extra electrons. Thus the neutral atom will have 2 electrons. Electronic configuration:2,8,6 (removing those two extra electrons). Sulphur is having 16 electrons and hence the element is sulphur.
Down
Argon is a noble gas with 18 electrons.Hence its electronic configuration:2,8,8.
Uni positive cation means the neutral atom has lost one electron. Thus the neutral atom will have a total number of electrons = 2+8 +1=11. Sodium has atomic number 11 and hence 11 electrons. Thus the electronic configuration:2,8,1.
Di positive cation means the neutral atom has lost two-electron. Thus the neutral atom will have a total number of electrons = 2+8+8+2 = 20. Calcium has atomic number of 20 and hence it has 20 electrons.
