Question

3. ‘X’ a brown-coloured shining element with atomic number one unit greater than

Nickel, when burnt in air, turns black. What is ‘X’? What is the black coloured

substance?​

Answer 1

$\huge\colorbox{red}{A}\colorbox{lime}{n}\colorbox{cyan}{S}\colorbox{orange}{w}\colorbox{blue}{E}\colorbox{violet}{r}$

The shinny brown colored element 'X' is copper. When it is heated in air, it becomes black due to the deposit of copper oxide.

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Answer 2

Answer:

the answer is copper which is written as CU

because it's atomic number is 29 and the atomic number of nickel is 28