Answer:
It would take 3.64 hours to travel.
Explanation:
200km with 55 per hour.
200 divided by 55 would equal 3.64.
I am dividing because to solve time would be distance/rate.
I hope this helps! :)
The characteristic that helium has that distinguishes it from the noble gases would be that it only has 2 valence electrons while noble gases has a completely filled orbitals giving it 8 valence electrons and a stable electron configuration. The valence electrons is the number of electrons that is present in an atom that can take part in the formation of bonds. These electrons can be found on the outermost shell of an atom. Helium is an exception to the octet rule, its atom has only two available electrons in its outermost shell since it only has one eletron shell that is the only the s orbital which can hold two electrons only.
<span>The key in
the balancing of chemical reaction is to make sure that you got the exact
chemical formula of the substance that is reacting and the yielded product.
After getting the formula, identify first the hardest element/atom to be
balanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such as
O, H. Make sure to note the atoms present in the molecule of the substance. Among
the three equations, PCl2 + 4H2O --->H3PO4 + 5HCL is not balanced. The
hardest element here is the Cl. Observe that there are 5Cls in the product side
so you must add 5 to the PCl2. However, there are only 2Cl atoms and it needs
3 to balance the equation. Also, there is no P in the product side. This equation
is invalid.</span>
Na+ and Cl- are the answers