True. These ions are of a 2- charge. Oxygen is an example. It will form a 2- charge if ionize.  
 
        
             
        
        
        
Answer: 2.58 days
Explanation:
Expression for rate law for first order kinetics is given by:
 
where,
k = rate constant  = ? 
t = age of sample  = 6 days
a = initial amount of the reactant  =  1 g
a - x = amount left after decay process  
= 0.2 g
a) to find the rate constant
 
 
 
b) for completion of half life:  
Half life is the amount of time taken by a radioactive material to decay to half of its original value.
 
 
The half life is 2.58 days
 
        
             
        
        
        
ANSWER: 
A proton has a "positive charge" and is found in the nucleus.
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Answer:
Haptens.
Explanation:
Haptens are known as small molecules that help to stimulate the production of antibody molecules when attached with a large molecule known as a carrier molecule such as proteins.
Haptens are used to study the mechanism of inflammatory bowel disease to help induce the autoimmune type of responses and allergic contact dermatitis.