Question

The periodic table can be used to predict properties of elements.

Information
The periodic table.Short description, The periodic table.,Long description,
The full periodic table is shown. The following elements are highlighted.

Element Symbol Period Group Atomic Number Electronegativity
Upper N a 3 1 11 0.9
Upper K 4 1 19 0.8
Upper M g 3 2 12 1.2
Upper F 2 17 9 4.0
Upper I 5 17 53 2.5


Question
Which ,begin emphasis,two,end emphasis, elements are highly reactive with water and can exist as cations?

Answer options with 5 options
A.
Upper N a

D.
Upper F

B.
Upper K

E.
Upper I

C.
Upper M g

Answer 1

A. Upper Na and B. Upper K