Question

question 6 (mandatory) (1 point)
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the absorption and emission spectra of an atom and its ion(s) are different. this is evidence that the spectra observed are due to energy changes associated with the
a) neutrons.
b) protons.
c) electrons.
d) electromagnetic interactions.
e) nuclei.
question 7 (mandatory) (1 point)
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which is the correct symbol for an isotope that contains 33 protons, 33 electrons, and 42 neutrons?

Explanation:

Question 6

Absorption and emission spectra result from electrons transitioning between energy levels. Neutrons and protons in the nucleus are not directly involved in these spectral - related energy changes. Electromagnetic interactions are the cause of the transitions but the specific particles involved in the energy - level changes giving rise to the spectra are electrons.

The atomic number (Z) is equal to the number of protons. Here, Z = 33, and the element with atomic number 33 is arsenic (As). The mass number (A) is the sum of protons and neutrons, so A=33 + 42=75. The notation for an isotope is $_{Z}^{A}\text{X}$, where X is the element symbol.

Answer:

C. electrons

Question 7