How many valence electrons does Ni have?

Answer 1

Two

Valence electron
Electron present in valence shell of an atom is called valence electron.

Valence shell
The valence shell is the outermost shell of an atom in its uncombined state, which contains the electrons most likely to account for the nature of any reactions involving the atom and of the bonding interactions it has with other atoms.

Outermost shell of Ni is 4th shell i.e N shell. It contains 2 electrons.
Therefore Ni has 2 valence electrons.

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Answer 2

Wyatt Atkins

Nickel (Ni) has 2 valence electrons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.