The atomic number of an atom is equal to which of the following?
A) the number of protons in the atom
B) the number of neutrons in the atom
C) the total number of protons and neutrons in the atom
D) the total number of protons, neutrons and electrons in the atom
A
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Eco-labeling
A. helps environmentalists recognize each other. B. is used by governments to identify individuals who matter. C. requires disposable labels and is environmentally unsound. D. identifies products produced by environmentally sound methods. E. helps scientists identify fragile ecosystems.
Which event does not occur during the decay of potassium-40 isotopes?
A) An electron orbiting near the nucleus enters into the nucleus and combines with a proton to produce a neutron. B) Electrons rearrange, producing x-rays. C) A neutron changes to a proton and emits an electron. D) A proton is ejected from the nucleus.
Without the atmospheric greenhouse effect, the average surface temperature would be:
a. higher than at present. b. lower than at present. c. the same as it is now. d. much more variable than it is now.
The deadly 1985 eruption of Nevado del Ruiz is an example of inaccurate prediction
Indicate whether the statement is true or false