Which best explains why sawdust burns more quickly than a block of wood of equal mass under the same condition

more molecules in the sawdust can collide with oxygen molecules

Explanation:

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.