They have different number of neutrons.
Physical, chemical, physical, chemical, chemical, physical, chemical, chemical, physical, and physical
B and i don’t need to explain it says it there hope it helps
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Answer:
<em>B</em>
Explanation:
<em>The atomic radius increases as you go down a group in the periodic table. Atoms get larger because more electrons are being added in higher energy levels, and each energy level is further from the nucleus than the last. Therefore, the atomic radius increases as you go down a group.</em>
