Question

Which of the following elements is placed along with cobalt in the same slot in Mendeleev's periodic table?

Silver

Nickel

Mercury

Lead​

Answer 1

Answer:

nickel

Explanation:

Cobalt is a chemical element with the symbol Co and atomic number 27. Like nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, produced by reductive smelting, is a hard, lustrous, silver-gray metal.