Which of the following is the best definition of half-life for a radioactive substance?
1 answer:
Ok so lets say something takes 20,000 years to get rid of a half life that means in 20,000 years the radioactivity will be half of what it originally was and then in anothor 20,000 years the half of the half of what was originally there and so on. But the only problem is it will never be completely gone.
Here is a chart from Wikipedia and i know oh its not reliable well i checked there sources are correct check if you want.
Here is a chart from Wikipedia and i know oh its not reliable well i checked there sources are correct check if you want.
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The reaction between hydrogen and oxygen to form water is given as:
The balanced reaction is:
According to the balanced reaction,
4 g of hydrogen () reacts with 32 g of oxygen (
).
So, oxygen reacted with 29.4 g of hydrogen is:
Hence, the mass of oxygen that is reacted with 29.4 g of hydrogen is 235.2 g.
Answer: The given transition metal ions in order of decreasing number of unpaired electrons are as follows.
Explanation:
In atomic orbitals, the distribution of electrons of an atom is called electronic configuration.
The electronic configuration in terms of noble gases for the given elements are as follows.
- Atomic number of Fe is 26.
So, there is only 1 unpaired electron present in .
- Atomic number of Mn is 25.
So, there are only 3 unpaired electrons present in .
- Atomic number of V is 23.
So, there are only 2 unpaired electrons present in .
- Atomic number of Ni is 28.
So, there will be 2 unpaired electrons present in .
- Atomic number of Cu is 29.
So, there is no unpaired electron present in .
Therefore, given transition metal ions in order of decreasing number of unpaired electrons are as follows.
Thus, we can conclude that given transition metal ions in order of decreasing number of unpaired electrons are as follows.