Correct! Both $$X$$ and $$Y$$ have an atomic number of $$1$$. As their atomic numbers are the same, their chemical properties will be similar.
• $$^6_3 X$$ and $$^7_3 Y$$
• $$^{10}_5 X$$ and $$^{12}_5 Y$$
• $$^5_3 X$$ and $$^6_3 Y$$
• $$^8_4 X$$ and $$^9_5 Y$$