Which elements have electron configurations that end in ns2np5?
2 answers:
Explanation:
The given configuration is and this shows that there are seven valence electrons present in the outermost shell. Therefore, it is a general configuration of group 17 which is also known as halogen group.
Elements of group 17 are fluorine, chlorine, bromine, iodine and astatine.
For example, fluorine is a group 17 element that has electronic configuration .
Value of n will start from 2 and increases on moving down the group.
Hence, we can conclude that halogens are the elements that have electron configurations that end in .
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Answer:
Average = 63.6
Explanation:
Average : The average of the given set of points can be calculated by dividing sum of the total point to the number of points.
The points that are given in this equation are:
83.2 , 44.6 , 74.4 , 52.3 .
These are 4 in number . So average is
Significant digits : It is the number of digits that carry meaningful value to a measurement. The rules for counting number of significant digits are:
1. all non-zero digit are significant
2.Any zero between two non-zero are also significant.(305 = 3 significant digit )
3. Zero before the decimal are non-significant (0.003 = only 1 significant digit)
Zero after decimal are significant (3.00 has 3 significant digit)
4.Zero after non - zero digit is non significant (300 has 1 significant digit).
Significant digits in division :
The answer should have the significant digits that are least in any of number(83.2 , 44.6 , 74.4 , 52.3 )
All have = 3 significant digits.
So least numner of significant digit =3
Answer should have total = 3 significant digits
So,
Average = 63.6