Does nickel form a precipitate when mixed with ammonia or does it form a soluble product?

Nickel forms precipitate when it reacts with ammonia

Explanation:

The reaction between Nickel and ammonia is such that produces a precipitate which dissolves when excess amount is added to it.

At first, the precipitate produces a green precipitate of Ni(OH)₂ when more ammonia is added, the precipitate eases or dissolves, to form a  solution of complex ion of Nickel forms.

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

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since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.