Answer:
26.981539 u
Explanation:
One mole of Al atoms has a mass in grams that is numerically equivalent to the atomic mass of aluminum. The periodic table shows that the atomic mass (rounded to two decimal points) of Al is 26.98, so 1 mol of Al atoms has a mass of 26.98 g.
As the period number increases on the periodic table, moving from top to bottom, the atomic radius of the elements increases as well.
Answer:
By absorbing energy on evaporation and releasing it on condensation, it keeps water cool when the air is hot and warm when the air is cool.