<span>Kc = [NO2]^4 / [N2O]^2[O2]^3</span>
Explanation:
Tc - 99 is technetium 99.
It is a radioactive element that decays spontaneously. It has a half-life of 211,000 years and decays to stable ruthenium.
- On the periodic table, it has an atomic number of 43;
Mass number = 99
Atomic number = number of protons = number of electrons in atom
Number of protons in Tc is 43
electron is 43
Mass number = number of protons + number of neutrons
Number of neutrons = mass number - number of protons = 99-43 = 56
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Atomic number brainly.com/question/2057656
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Answer: Dipole moment 
Explanation: Dipole moment is defined as product of magnitude of the charge and the distance between the charges of equal magnitude and opposite sign is called as dipole moment.
S.I unit of dipole moment is Debye (D).
Debye was defined as the dipole moment resulting from two charges of opposite sign but an equal magnitude of 
stat coulomb (generally called e.s.u. (electrostatic unit) which were separated by 1 angstrom.(1 angstrom 
cm)
He is making a conclusion from a single observation.
Silver isn’t the only metal that is shiny and has no colour.
For example, lithium, sodium, magnesium, and aluminium all have about the same colour as silver.
