Period 4 and period 5 of the periodic table have the same number of elements. The periods are numbered 1 through 7 on the left-hand side of the table. The element A would probably have a (smaller/larger)atomic size than B. Although Period 6 contains 32 elements, elements with proton numbers 57 to 71 are arranged separately at the bottom of the Periodic Table. 23rd July 2018, 5:54 PM 18 elements. And so I can continue with numbering my periods, so this would be period 3, 4, 5… The Group 8 elements usually have the electron configuration ( n -1) d 6 ns 2 , the Group 9 elements usually have the electron configuration ( n -1) d 7 ns 2 , and the Group 10 elements usually have the electron configuration ( n -1) d 8 ns 2 . Periods 4 and 5 have 18 elements. The two elements of period 5, Rb and Sr are also known as s-block elements. There are 18 elements present in period 5. Period 1: H and He Period 2: C, N, O, F, Ne Period 3: P, S, Cl, Ar Period 4: Se, Br, Kr Period 5: I, Xe Period 6: Rn Period 7 contains 27 elements. There are 17 nonmetals on the periodic table. Elements that are in the same period have chemical properties that are not all that similar. Periods 2 and 3 contain 8 elements respectively. There are 18 elements in each period. Period 1 has only two elements (hydrogen and helium), while periods 2 and 3 have 8 elements. Periods 6 and 7 have 32 elements because the two bottom rows that are separated from the rest of the table belong to those periods. The six elements of period 5, In, Sn, Sb, Te, I and Xe are also known as p-block elements Look up chemical element names, symbols, atomic masses and other properties, visualize trends, or even test your elements knowledge by playing a periodic table game! The elements found on the left side of the periodic table are typically metals. period 1 - 2 elements period 2 & 3 - 8 elements period 4 & 5 - 18 elements period 6 - 32 elements a. In period 2 element A is to the right of element B. Elements can be categorized into three major groups that include metals, nonmetals, and metalloids. The elements in each period of these groups are very similar in their chemical and physical properties. At b. Li c. Ar d. C. Write the electron configuration of the following. While the elements on the right side of the periodic table are non-metals. Period 6 contains 32 elements. The ten elements of period 5, Y, Zr, Nb, Mo, Tc, Ru, Rh, Pd, Ag and Cd are also known as d-block elements. As a rule, period 5 elements fill their 5s shells first, then their 4d, and 5p shells, in … Consider the first two members of period 3: sodium (Na) and magnesium (Mg). I move on to the second period, so lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, and neon. 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