1. Circle the atom in each pair that has the larger atomic radius. a. Li or K f. Ca or Ni b. Ga or B g. O or C c. Cl or Br h. Fe or Ru d. Be or Ba i. Si or S 2. Circle the ion in each pair that has the smaller ionic radius. a. K+ or O2-e. K+ or Cs+ b. Ba2+ or I-f.
Based on their positions in the periodic table, predict which has the smallest atomic radius: Mg, Sr, Si, Cl, I. 68 . Based on their positions in the periodic table, predict which has the largest atomic radius: Li, Rb, N, F, I.
Apr 04, 2018 · Atoms are very small, having a radius of about 0.1 nm (1x 10-10 m). The radius of a nucleus is less than 1/10 000 of that of the atom (about 1 x 10-14 m). All atoms of a particular element have the same number of protons. Atoms of different elements have different numbers of protons. The number of protons in an atom is called its atomic number The Periodicity of Atomic Radii The atomic radius of atoms decreases going from left-to-right across a period. • Across a period, the effect of shielding decreases which allows the valence electron to be held tighter. • Atomic radius increases down a group. Each step down involves adding a new shell, which increases size.
Write the symbol of each element described below. (a) largest atomic radius in Group 1 (b) smallest atomic radius in period 3 (c) largest first ionization energy in Group 2 (d) most electronegative in Group 16 (e) element(s) in period 2 with no unpaired p electron (f) abbreviated electron configuration is [Ar] 4s 2 3d 3 (g) A +2 ion with abbreviated electron configuration [Ar]3d 5 (h) A ...
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