Carbon has 6 protons, that's why its atomic number is 6
<span>The particles in a solid are closer together than the particles in a liquid.
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Radioactive elements undergoes first order decay.
Now, for 1st order decay kinetics, rate constant (k) can be estimated as follows
k = 0.639/ t1/2,
where t 1/2 = half-life of radioactive material = 8 days (For Pb-209)
Also, we know that
.................(1)
Here, Co = initial conc. of radioactive element
Ct = conc. of radioactive element at time t
t = time required to reach the concentration Ct
Thus,
<span>
equation 1 can be used to estimate the amount of lead-209 present after 't' days.</span>
The line spectra of an atom offers conclusive evidence that electron energies are quantized.
Neils Bohr showed that electrons in an atom can absorb or emit energy when they move from one energy level to another. This principle is the basis upon which the spectra of atoms is built.
The true statements about the atomic spectra is;
- The line spectra of elements are evidence that electron energies are quantized
- Energy is emitted from atoms as they move from higher energy levels to lower energy levels
Learn more about atomic spectrum: brainly.com/question/2049494
Answer:
Acids react with most metals to form hydrogen gas and salt. ... When an acid reacts with metal, salt and hydrogen gas are produced