Answer:
1. 208
2. 82
3. Pb
Explanation:
²¹²₈₄Po —> ⁴₂He + ᴬZX
1. Determination of mass number A of the new atom.
212 = 4 + A
Collect like terms
212 – 4 = A
208 = A
A = 208
Thus, the mass number is 208
2. Determination of the atomic number Z of the new atom.
84 = 2 + Z
Collect like terms
84 – 2 = Z
82 = Z
Z = 82
Thus, the atomic number is 82.
3. Determination of the symbol of the new atom.
ᴬZX => ²⁰⁸₈₂X
The atomic number of the new atom is 82. Comparing the atomic number of the new atom to those in the periodic table, the new atom is lead with symbol Pb.
Thus,
²⁰⁸₈₂X => ²⁰⁸₈₂Pb
Therefore, the symbol of the new atom is Pb.
<span>It's because The oil and the glass fibers do not interfere with X-ray crystallographic measurements because only one is crystalline.
</span><span>Glass fibers have a low absorbance for </span>X-rays<span> and is </span><span>not crystalline. Because of this, glass fibers will not interfere with X-Ray patterns. Oil, on the other hand, could be considered as crytalline.</span>
Answer:
Your answer will be "Over the ocean"
Explanation:
Have a good day/night
Hope this helps! :)
Mark as brainliest?
Answer:
Earth Science?
Explanation:
its not marine science or life so its physical or earth
Answer:
Photon of light
Explanation:
According to Bohr's model of the atom, electrons in atoms are found in specific energy levels. These energy levels are called stationary states, an electrons does not radiate energy when it occupies any of these stationary states.
However, an electron may absorb energy and move from one energy level or stationary state to another. The energy difference between the two energy levels must correspond to the energy of the photon of light absorbed in order to make the transition possible.
Since electrons are generally unstable in excited states, the electron quickly jumps back to ground states and emits the excess energy absorbed. The frequency or wavelength of the emitted photon can now be measured and used to characterize the transition. This is the principle behind many spectrometric and spectrophotometric methods.