An element is identified as either a

Elements can be defined by their unique properties and atomic.

(Hope this helps) Sky

Elements can be defined by their unique properties and atomic number

Explanation:

Each element has a diffrent atomic number for example hydrogen has an atomic number of 1

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~chara

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

the awnser is group 12