The reaction described is a combination or synthesis reaction. In this type of reaction, two or more substances combine to form a new compound.
For the reaction of nickel metal and fluorine gas yielding solid nickel(II) fluoride:
Balanced Chemical Equation:
N
i
(
s
)
+
F
2
(
g
)
→
N
i
F
2
(
s
)
Ni
(s)
+F
2(g)
→NiF
2(s)
This equation represents the combination of nickel (Ni) with fluorine gas (F2) to produce solid nickel(II) fluoride (NiF2).