The answer is neutrons and protons.
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The periodic table is organized by the atomic mass of the elements. It means if the element is in Group 2a in the periodic table, it has 2+ ions.
The answer is C) catalyst speed up reactions and activation energy
Answer:
C
Explanation:
Spontaneous combustion is a type of combustion which occurs by self-heating (increase in temperature due to exothermic internal reactions), followed by thermal runaway (self-heating which rapidly accelerates to high temperatures) and finally, ignition.