How many core electrons does an atom of beryllium (Be) contain? A) 0 B) 1 C) 2 D)3 E) 4Which of the following metals would be expected to have the smallest atomic radius? A) Cesium (Cs) B) Barium (Ba) C) Lanthanum (La) D) Europium (Eu) E) Tantalum (Ta)Rank the following atoms in order of decreasing size (i.e., largest to smallest): Rb, F, Mg, B, N. A) Rb > Mg > B>N>F B) N > F >B> Mg > Rb C) Rb > Mg...