7 valence electrons. Hopefully that's right
The answer is B) Zinc will replace lead (...)
Answer:
32,0 days.
Explanation:
The radioactive decay follows:
Where Nt is the concentration in a time t (6,22x10¹⁷), N₀ is the initial concentration (9,95x10¹⁸) Half life time is 8,0 days and t is the time it take to drop this concentration. Replacing:
It take <em>32,0 days</em>
<em></em>
I hope it helps!
Elements that are unreactive can be useful for 'isolating' other volatile elements. For example, an element may be highly reactive with oxygen, so keeping it in air is not a safe option. In such cases, it may be useful to have a noble gas to store the element safely and ensure its stability. It may also have a purpose in experiments where it may act as a controlling agent or a container for the other reactions.
The equation for the production of Ammonia is:
N₂ + H₂ → NH₃
N₂ + H₂ (LeftHandSide of equation) : 2 Nitrogen atoms; 2 Hydrogen atoms
NH₃ (RightHandSide of equation): 1 Nitrogen Atom; 3 Hydrogen atoms
To balance the equation you must place in front of each compound/molecule/element that makes the amount of atom of each element equal on both sides of the equation.
N₂ + 3H₂ → 2NH₃
LHS RHS
Nitrogen 2 2
Hydrogen 6 6
So essentially the set of coefficients you use to balance the equation are 1 for N₂, 3 for H₂ and 2 for NH₃.
