Answer:
42 days
Explanation:
Half life = 8.4 days
Starting mass = 40.0 g
Time = ?
Final Mass = 1/16 * 40 = 2.5 g
First Half life;
Remaining mass = 40 / 2 = 20g
Second Half life;
Remaining mass = 20 / 2 = 10g
Third Half life;
Remaining mass = 10 / 2 = 5g
Fourth Half life;
Remaining mass = 5 / 2 = 2.5g
Time = Number of half lives * Duration of half life = 5 * 8.4 = 42 days
The reactivity and other chemical properties of an organic molecule are primarily dependent upon <span>the attached functional group </span>of the molecule.
For example hydroxyl group (-OH) in alcohols or carboxyl group in c<span>arboxylic acid are poplar groups and that is why this compounds are polar.</span>
The atoms of functional groups are linked to each other and to the rest of the molecule with covalent bonds.
Answer:
It belongs to the last group with all the gas whose last shell are common and they are unreactive unlike to other elements which reacts to complete there last shell with total 8 electrons . Helium and Neon have in common that they have there shell complete and they reacts very less or they don't.
Explanation:
Hope it is helpful....
I believe that the answer is Oxygen. Hope this helps. :)