An atom has 23 protons and 29 neutrons. which is the correct chemical symbol for this atom?

Chemical symbol is 'V'

Explanation:

No. of protons = 23

No. of protons = Atomic number

So, the atomic number of the element = 23

Mass number = No. of protons + No. of neutrons

                        = 23 + 29

                        = 52

Elements with atomic number 23 and mass number 52 is vanadium.

Chemical symbol of vanadium is 'V'.

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.

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