Length = 10cm
width = 5cm
mass = 300g
height = 2cm
volume =?
density =? Pls help

volume=100

density=100

Explanation:

to get volume you multiply length and width to get area then multiply height=100

to get density you divide mass by volume

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.

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.