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Alika [10]
3 years ago
14

Connect the group to the configuration.pleas help !!

Chemistry
2 answers:
butalik [34]3 years ago
8 0

Answer:

 2, 8 7                7 valence electrons        Group 7

 2, 8 , 1              1 valence electrons         Group 1

 2 8 3               3 valence electrons         Group 3

  2  4               4 valence electrons         Group 4

 2 8 8 2            2 valence electrons         Group 2

Explanation:

The valency of an electronic configuration of an atom can be used to determine the group an element belongs.

The valency is the number of outermost shell electrons an atom contains.

 So;

 2, 8 7                7 valence electrons        Group 7

 2, 8 , 1              1 valence electrons         Group 1

 2 8 3               3 valence electrons         Group 3

  2  4               4 valence electrons         Group 4

 2 8 8 2            2 valence electrons         Group 2

LenaWriter [7]3 years ago
7 0

Explanation:

The group number in the periodic table represents number of valence electrons of the elements in a certain group.

Group 1 : 2,8,1

Group 2 : 2,8,8,2

Group 3 : 2,8,3

Group 4: 2,4

Group 7 : 2,8,7

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A stock solution of HNO3 is prepared and found to contain 13.5 M of HNO3. If 25.0 mL of the stock solution is diluted to a final
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Answer : The correct option is, (C) 0.675 M

Explanation :

Using neutralization law,

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M_2 = concentration of diluted solution = ?

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