Select the correct statements.

A $X_{18}^{40} X_{218}^{240} Ar$ and $X_{20}^{40} X_{220}^{240} Ca$ are isobars
B $X_{15}^{31} X_{215}^{231} P$ and $X_{16}^{32} X_{216}^{232} S$ are isotones
C $X_{1}^{1} X_{21}^{21} H$ and $X_{1}^{2} X_{21}^{22} H$ are isotones
D $X_{11}^{23} X_{211}^{223} Na$ and $X_{12}^{24} X_{212}^{224} Mg$ are isobars

Answer: A, B

Ar-40 and Ca-40 share mass number 40 (isobars). P-31 has 16 neutrons and S-32 has 16: isotones. H-1 and H-2 have 0 and 1 neutrons and are isotopes. Na-23 and Mg-24 have different mass numbers, so they are not isobars (both have 12 neutrons, so they are isotones).

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