An electron in a sodium atom gains enough energy to move from the second shell to the third shell. the sodium atom becomes:
(1) a positive ion
(2) a negative ion
(3) an atom in an excited state
(4) an atom in the ground state

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explanation:

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.