Find the element:
1. A group 12 metal that was once used in thermometers, but now it’s know to be poisonous.
2. Has 3 valence electrons and 4 energy levels.
4. The only metalloid with 3 valence electrons.
5. It’s most common isotope has 5 neutrons.

Respuesta :

Answer:

.

Explanation:

  1. mercury
  2. gallium
  3. boron
  4. beryllium