Answer:
Na, K
Step-by-step explanation:
From the given choices, the two elements that will react similarly are Na and K.
This is because, Na and K are in the same group on the periodic table.
Na and K are both called Alkali metals and they have just one electron in their outermost shell.
The number of electrons in the outermost of an atom determines their chemical properties.
Since Na and K are in the same group, they chemically combine with other atoms in similar fashion.