Volumetric flask are calibrated to contain.
Electrons are located in the orbits around the nucleus... we can name them as shells K,L,M,N...
[A] 0
When opposing forces act on an object, this means that the object isn't moving at all. This is also known as a "balanced force." If the forces of the same and you add them together the answer is 0.
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K₂CrO₄ + PbCl₂ = PbCrO₄ + 2KCl
v=500.0 mL = 0.5000 L
c=3.0 mol/L
M(PbCrO₄)=323.2 g/mol
m(PbCrO₄)/M(PbCrO₄)=n(K₂CrO₄)=cv
m(PbCrO₄)=M(PbCrO₄)cv
m(PbCrO₄)=323.2*3*0.5=484.8 g
<span>The amount of
protons is equal to the number of electrons of a chemical element. The atomic
number of an element also determines the number of the protons it contains.
The number of protons is also the same number of electrons. Protons are positively charged, electrons are
negatively charged. To get the number of neutrons, all you need is to deduct
the number of the atomic mass or mass number from the atomic number. Potassium has 19
protons, therefore has 19 electrons as well. The atomic mass of Potassium is
39. So, the number of neutrons Potassium has is 20. </span>
Potassium
Atomic
number: 19
Protons: 19
Electrons: 19
Atomic Mass:
39
Neutron: 20
Nitrogen
Atomic
number: 7
Protons: 7
Electrons: 7
Atomic Mass:
14.007
Neutrons: 7
Oxygen
Atomic
Number: 8
Protons: 8
Electrons: 8
Atomic Mass:
15.99
Neutrons: 8