Question

Which of the following is the most active metal ?

$\begin{array}{cccccccc}Period& & & & & & & \\ \downarrow & Group& Group& Group& Group& Group& Group& \\ & 1& 2& 14& 15& 16& 17& \\ 2& \left(A\right)Li& Be& \left(D\right)C& N& O& \left(E\right)F& \\ 3& \left(B\right)Na& Mg....& & & & & \\ 4& \left(C\right)K& & & & & & \end{array}$

• A. $Li$
• B. $Na$
• C. $K$
• D. $C$
• E. $F$

Answer 1

Answer: (C)

$K$

Potassium, $K$ is the most active metal as it has lowest ionisation energy. It can readily lose an electron and has high electropositive character.