'How many atoms are in 2.45 moles of copper? 2.46 × 1023 atoms

2.45 atoms

155.70 atoms

1.48 × 1024 atoms

All the elements are arranged by melting points on the periodic table. in row they go from metals to gasses. in the row from sodium to argon, sodium is more reactive than the one on its right, magnesium.

Answer the air near the ground cools to its dew point

The answer is ax3. hope this

Remember that rust prevented by placing a sacrificial electrode in electrical contact with the iron. the sacrificial electrode must be composed of a metal that  oxidizes  more easily than iron (that is, it must be below iron in table 18.1).