20. The density of lead is 11.3 g/cm3. A cubed of metal had a measurement of 2.25 cm on each side and had a mass of 129.5g. Is the metal lead?

The climate of the continental united states is generally 1. tropical 2. temperate 3. arctic 4. highland

Me i dont know what to do! the table compares the number of electrons in two unknown neutral atoms. comparison of electrons atom number of electrons a 10 d 11 use this information to determine the number of valence electrons in the atoms. which of the following correctly compares the stability of the two atoms? both are unreactive. both are highly reactive. a is unreactive and d is reactive. a is reactive and d is unreactive.

Which statement is true about this reaction? 14n+1h 15o it is a practical source of energy on earth. it occurs only outside the solar system. its product is heavier than each of its reactants. it shows the critical mass of an element.