please answer all with short justification so i understand.

1. Predict which atom will have the larger atomic radius. Justify your choice. a) Sn or Si b) Bror Ga c) Se or Sn 2. Arrange these elements in order of decreasing atomic radius. (No justification required.) Cs, Sb, S, Pb, Se 3. Arrange these ions in order of increasing (atomic) radius. (No justification required.) Br, Rb, See, Sr2 4. Arrange these elements in order of decreasing first ionization energy. (No justification required.) CI, S, Sn, Pb