15. Nickel has an atomic weight of 58.69 and cobalt has an atomic weight of 58 .93 Despite this Mendelee listed cobalt before nickel in his periodic table. What information caused Mendeleev to order the elements in this way? The properties of nickel more closely resembled those of palladium than those of rhodium Cobalt had a lower atomic number than nickel. Nickel had one more electron in its 3dorbital than cobalt. The properties of cobalt more closely resembled those of iron than those of copper.

Question

15. Nickel has an atomic weight of 58.69 and cobalt has an atomic weight of 58 .93 Despite this Mendelee listed cobalt before nickel in his periodic table. What information caused Mendeleev to order the elements in this way? The properties of nickel more closely resembled those of palladium than those of rhodium Cobalt had a lower atomic number than nickel. Nickel had one more electron in its 3dorbital than cobalt. The properties of cobalt more closely resembled those of iron than those of copper.

Answer 1

The properties of cobalt more closely resembled those of iron than those of copper.

Answer 2

Mendeleev ordered elements based on their chemical properties rather than their atomic weights. He placed cobalt before nickel because cobalt's properties more closely resembled those of iron, fitting better into the periodic trends he observed.

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