When alpha particles were shot at a gold foil target, most of the particles were not deflected. This indicated to Rutherford that (A) the gold foil was continuous matter. (B) the mass of the gold atoms was spread out thinly. (C) the atoms of gold were mostly empty space. (D) the alpha particles had great penetrating power. (E) the alpha particles had charges opposite to those on the 1. 4. The (M (A nuclei. 5. T 2. An atom has a valence shell electron configuration of ns1. To which group of elements in the periodic table does it belong? (A) transition metals (B) lanthanide metals (C) alkaline earth metals (D) alkali metals 6. 3. Which of these atoms has the greatest number of neutrons in its nucleus? 56 (A) 25 Mn 52 (B) 26 Fe (C) 26 Fe (D) 27 Co (E) 28 Ni 56 Solution 1. Correct Option is \'C\' i. e The atoms of the gold were mostly empty space. 2. Correct Option is \'D\' exponent 1 represents the no. of valence electrons which are group 1 elements that is alkali metals 3. Correct Option is \'A\' Subtracting the Atomic No. from the Atomic Weight. That gives us the number of neutron. i. e 56 25 Mn Thank you .