An atom has an average atomic mass of about 63.5 amu. what is the chemical symbol for the atom? consult the periodic table.
(points : 3)
pb

fe

eu

cu

Answer : The chemical symbol for the atom is Cu.

Explanation :

Average atomic mass of an element is defined as the sum of masses of each isotope each multiplied by their natural fractional abundance.

The atomic mass of lead (Pb) = 207.2 amu

The atomic mass of iron (Fe) = 55.9 amu

The atomic mass of europium (Eu) = 151.9 amu

The atomic mass of copper (Cu) = 63.5 amu

From this we conclude that the chemical symbol for the atom that has an average atomic mass of about 63.5 amu is copper (Cu).

Hence, the chemical symbol for the atom is Cu.

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~batmans wife dun dun

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.