morganruhl2
08.10.2020 •
Chemistry
S, selentum 83 has a half life
of 250 minutes, How many mintes.
would it take for a 100 mg
Sample to decay and have only
11,125 mg of it remain?
Solved
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Ответ:
The correct answer is Bromine.
Explanation:
Elements are distributed into 7 Periods and 18 Groups. The elements which have same number valence electrons or which belong to same group will show similar chemical properties.
Fluorine is the element which belongs to Group 17. The electronic configuration of this element is
The number of valence electrons of this element is 7.
For the given options:
Option 1: Ne
This element belongs to Group 18. The electronic configuration is:
The number of valence electrons of this element is 8.
Option 2: N
This element belongs to Group 15. The electronic configuration is:
The number of valence electrons of this element is 5.
Option 3: Li
This element belongs to Group 1. The electronic configuration is:
The number of valence electrons of this element is 1.
Option 4: Br
This element belongs to Group 18. The electronic configuration is:![[Ar]4s^23d^{10}4p^5](/tpl/images/0444/6289/d71de.png)
The number of valence electrons of this element is 7.
From the above information, we can conclude that the element which shows similar chemical properties to fluorine is Bromine.