What metals are most reactive?

here in increasing order:
1.) li,
2.) na,
3.) k,
4.) cs.

so, cs reactive.

understand this, first must know given metals need lose 1 electron attain noble gas configuration (ie have complete outer orbital.) size increases, harder nucleus hold on outer electron , lets go more easily.

size increases down group due increase in orbit. so, if see periodic table (refer link below) find elements in above order because cs has largest size.

hence, given result.

hope helped!

link of periodic table:
http://www.ptable.com/

which of following metals reactive? ( li, cs, k, na)

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