Christy is studying sodium in the following periodic table of elements. She makes the following list of possible properties for sodium:
Symbol is Na
Is a transition metal
Atomic number is 11
Has 12 neutrons
Which of these should Christy remove from this list?

Chritsy must remove option A i.e "Is a transition metal"

Explanation:

Sodium is not a transition metal. It is a group  element. Transition metal have very high density and boiling temperature like chromium which is a transition metal. Sodium do not have high density and boiling temperature.

Hence the correct option to be removed is option A i.e "Is a transition metal"

when a reversible reaction is occurring in both directions at the same rate; the products and reactants do not change in concentration. a chemical reaction where the compound is broken into its constituent parts.