which metal in period 5 is very reactive and has two valence electrons in each atom?\nrubidium…

which metal in period 5 is very reactive and has two valence electrons in each atom?\nrubidium (rb)\nstrontium (sr)\nzirconium (zr)\nsilver (ag)

which metal in period 5 is very reactive and has two valence electrons in each atom?\nrubidium (rb)\nstrontium (sr)\nzirconium (zr)\nsilver (ag)

Answer

Brief Explanations:

  1. Recall the periodic - table trends: Elements in Group 2 (alkaline - earth metals) have 2 valence electrons.
  2. Among the given options, strontium (Sr) is in Group 2 and Period 5. Rubidium (Rb) is in Group 1, zirconium (Zr) is in Group 4, and silver (Ag) is in Group 11. Alkaline - earth metals are reactive metals.

Answer:

strontium (Sr)