The largest units of geologic time are called ______________
Fill in the blank(s) with correct word
eons
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Atomic number refers to the number of
A) protons in the nucleus. B) neutrons in the nucleus. C) nucleons in the nucleus.
What was discovered in atomic spectra by physics pioneers Balmer, Rydberg, and Ritz?
A) unexplained randomness B) mathematical order C) all atoms are about the same size D) electrons occupy well-defined shells about the atomic nucleus E) electrons behave as standing waves
Far infrared astronomy must be done from high-flying aircraft because
a. far infrared radiation is absorbed low in Earth's atmosphere. b. far infrared photons are quite energetic. c. far infrared telescopes are not very heavy. d. far infrared sources are very bright. e. None of the other choices are correct.
Each form element is called a(n) ______.
A. cell B. field C. tag D. label