Because ionic bonds form between oppositely charged particles. Opposit s attract.
If that’s not correct, give me the options and I can try to help further.
The properties of noble gases include:
- They are nonreactive
- They have hight ionisation energy
- They have low boiling point
- They conduct electricity at low pressure.
The noble gases are those elements that makes up the group 18 of the periodic table.
They are non as the inert gases because they are relatively nonreactive.
According to the electronic arrangement, which is according to how the electrons are arranged on their shells, they can exist alone.
The noble gases are nonreactive, have high ionisation energy and low boiling point because in its electronic arrangement, the outer shell is completely full.
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D. Biased data is likely skewed for or against some variable tested, meaning it isn't an honest study.
Answer :
The parent and daughter concentrations (in percentages) is, 60 % and 40 % respectively.
The age of rock is 
Explanation :
First we have to calculate the parent and daughter concentrations (in percentages).
and,
As we know that, the half-life of uranium-238 = 
years
Now we have to calculate the rate constant, we use the formula :
Now we have to calculate the time passed.
Expression for rate law for first order kinetics is given by:
where,
k = rate constant = 
t = time passed by the sample = ?
a = initial amount of the reactant = 3 g
a - x = amount left after decay process = 1.8 g
Now put all the given values in above equation, we get
Therefore, the age of rock is
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