Table:
0
A
B
C
D
E
1
Isotope
Half-life
Decay mode
Discovery year
Reaction
2
263 Hs
0.74 ms
α, SF
2008
208 Pb( 56 Fe,n)
3
264 Hs
~0.8 ms
α, SF
1986
207 Pb( 58 Fe,n)
4
265 Hs
1.9 ms
α, SF
1984
208 Pb( 58 Fe,n)
5
265m Hs
0.3 ms
α
1984
208 Pb( 58 Fe,n)
6
266 Hs
2.3 ms
α, SF
2000
270 Ds(—,α)
7
267 Hs
52 ms
α, SF
1995
238 U( 34 S,5n)
8
267m Hs
0.8 s
α
1995
238 U( 34 S,5n)
9
268 Hs
0.4 s
α
2009
238 U( 34 S,4n)
10
269 Hs
3.6 s
α
1996
277 Cn(—,2α)
11
269m Hs
9.7 s
α
2004
248 Cm( 26 Mg,5n)
12
270 Hs
3.6 s
α
2004
248 Cm( 26 Mg,4n)
13
271 Hs
~4 s
α
2004
248 Cm( 26 Mg,3n)
14
272 Hs
40? s
α, SF ?
unknown
—
15
273 Hs
0.24 s
α
2004
285 Fl(—,3α)
16
274 Hs
1? min
α, SF ?
unknown
—
17
275 Hs
0.15 s
α
2003
287 Fl(—,3α)
18
276 Hs
1? h
α, SF ?
unknown
—
19
277 Hs
2 s
α
2009
289 Fl(—,3α)
20
277m Hs ?
~11 min ?
α
1999
289 Fl(—,3α)

Questions and formulas:
Question: What is the half-life discovered in 2003?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1=2003),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E20,D2:D20=2003),2))
Level: medium
Question: What is the decay mode of the 265m hs isotope discovered in 1984?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1=1984)*(A1="265m hs")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E20,(D2:D20=1984)*(A2:A20="265m hs")),3))
Level: medium