The element sodium, Na, has an atomic number of 11 and an atomic mass of 23.0 atomic mass units (amu). Which of these elements is MOST likely to have similar chemical reactivity as sodium?

Select one:

a.
neon, Ne, which has a similar symbol

b.
magnesium, Mg, which has an atomic mass of 24.3 amu

c.
aluminum, Al, which is in the same period on the periodic table

d.
potassium, K, which is in the same group on the periodic table