Which of these elements
has and atom with the most stable outer electron configuration (ne, ca, cl, na)

A. Ne ( Neon)

Explanation:

Neon has 8 valence electrons.  This is known as the stable octet.  All the Noble Gases, Group 18, have stable outer electron configurations.  

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.