Fill in the blanks:
$(1)$ Among all alkali metals,.......... is a radioactive element.
$(2)$ The half-life of $^{223}Fr$ is ..........
$(3)$ Among all alkali metal ions,............ has the highest ionization enthalpy.
$(4)$ Alkali metals are identified by the ........... test.
$(1)$ Among all alkali metals,.......... is a radioactive element.
$(2)$ The half-life of $^{223}Fr$ is ..........
$(3)$ Among all alkali metal ions,............ has the highest ionization enthalpy.
$(4)$ Alkali metals are identified by the ........... test.
(N/A) $(1)$ Francium
$(2)$ $21 \ \text{minutes}$
$(3)$ $Li^{+}$
$(4)$ Flame
$(2)$ $21 \ \text{minutes}$
$(3)$ $Li^{+}$
$(4)$ Flame
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