When an unstable nucleus decays by emitting an alpha particle, the atomic number of the nucleus
A) increases by 4.
B) increases by 2.
C) decreases by 2.
D) decreases by 4.
E) remains unchanged.
C
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The clouds of Venus consist mainly of ________.
A. carbon dioxide B. sulfuric acid C. carbon monoxide D. hydrogen and helium E. water vapor
Shell Radius: A hydrogen atom with a barely bound electron may have an average radius as large as a bacterium, which is a radius of 14 ?m. What is the nearest principal quantum number of the atom in this state? The radius for ground state hydrogen is 0.0529 nm.
A. 514 B. 51 C. 16 D. 264,650
When rocks and geologic events are placed in chronological order without regard to actual dates, ______________ geologic time is obtained
Fill in the blank(s) with correct word
Polaris has always been the star nearest the north celestial pole
Indicate whether the statement is true or false