What quantity of heat is needed to raise the temperature of 28.76 g of iron from 25°C to 1,535°C?*

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.

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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what is the question here. i think you messed up.