Question

17 the diagram below shows part of dmitri mendeleevs original periodic table, with symbols of known elements and their atomic masses. h = 1 be = 9.4 b = 11 c = 12 n = 14 o = 16 f = 19 mg = 24 al = 27.1 si = 28 p = 31 s = 32 cl = 35.5 cu = 63.4 zn = 65.2 x z as = 75 se = 79.4 br = 80 mendeleevs arrangement of elements is different than that of the modern periodic table. based on mendeleevs arrangement, which elements should be placed in the shaded boxes labeled x and z respectively? indium (in), because it has a slightly higher atomic mass than aluminum (al), and tin (sn), because it has a slightly higher atomic mass than silicon (si) cadmium (cd), because it has chemical properties similar to those of zinc (zn), and mercury (hg), because it has a lower atomic mass and properties similar to those of arsenic (as) antimony (sb), because it has a slightly higher atomic mass than zinc (zn), and bismuth (bi), because it also has a higher atomic mass than zinc (zn) gallium (ga), because it has chemical properties similar to those of aluminum (al), and germanium (ge), because it has chemical properties similar to those of silicon (si)

Explanation:

Mendeleev's periodic table was based on atomic mass. Gallium (Ga) has properties similar to those predicted by Mendeleev for eka - aluminium which has properties similar to aluminium (Al) and germanium (Ge) has properties similar to eka - silicon. In Mendeleev's table, elements were placed based on atomic mass and similarity of properties. Gallium fits the pattern as it has chemical properties similar to aluminium and germanium has properties similar to silicon as per Mendeleev's predictions and arrangements.

Answer:

Gallium (Ga), because it has chemical properties similar to those of aluminium (Al), and germanium (Ge), because it has chemical properties similar to those of silicon (Si)