Examlex
Sean Larson is an arson investigator.Which of the following should be his first step when investigating a possible arson?
Potassium
A chemical element with the symbol K, atomic number 19, and one of the alkali metals, essential for living organisms.
Electrons
Subatomic particles with a negative electric charge, found in electron shells around an atom's nucleus.
Neutral Atoms
Atoms with an equal number of protons and electrons, resulting in no overall electric charge.
Uranium-235
An isotope of uranium making up about 0.7% of natural uranium, significant for its ability to undergo fission and its use in nuclear reactors and weapons.
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