Question

Which of the following will be more reactive than magnesium (k),(Ca),(Be),(Ar)

Answer 1

K is more reactive.

Step-by-step explanation:

We follow the reactivity series to say which one is more reactive than the other.

Oxidation is loss of electrons by an atom or a species.

The element which gets oxidised easily is more reactive than the one which is less oxidised.

Zn undergoes more easily than Copper. Thus we say Zinc is more reactive than Copper.

`Zn+CuSO_4  >ZnSO_4+Cu`

Zinc is more reactive than copper thus it replaces copper in this reaction.

Copper cannot replace Zinc as it is less reactive. Thus No reaction occurs when Copper reacts with Zinc sulphate

`Cu+ZnSO_4  >No reaction`

We can observe this in the reactivity series or electrochemical series which is as follows

more reactive ……………………………………………………………………………….

`Li > Cs > Rb > K > Ba > Sr > Na > Ca > Mg > Be > Al > H(water) > Mn > Zn > Cr(+3) > Fe(+2) > Cd > Co > Ni > Sn > Pb > H(acids) > Cu > Fe(+3) > Hg > Ag > Pd > Ir > Pt(+2) > Au`

…………………………………………………………………………………..least reactive

So, The Answer will be K and Ca.

Moving down a group, the reactivity decreases.

Hence we can say that K is more reactive than Mg.

Answer 2

Potassium(K) is the most reactive element than magnesium.

Step-by-step explanation:

• The reactivity of an element mainly depends upon the shape and strength.

• Potassium and Magnesium belongs to the different group.

• Potassium atom is larger compared to that of magnesium and the "electronegativity" of potassium is less than the magnesium.

• Potassium has a single electron in its outer-shell and magnesium contains two-electron in its shell.

• "Ionization energy" of potassium is less than that of magnesium.

• Potassium tends to lose electrons and forms a positive ion in its group and thus makes it more "electropositive" than magnesium.