Number of Protons in Nickel — Atomic Structure Explained

Property | Value Element | Nickel Symbol | Ni Atomic Number (Z) | 28 Number of Protons | 28 Number of Electrons (neutral atom) | 28 Number of Neutrons (most common isotope ⁵⁸Ni) | 30 Atomic Mass | 58.693 amu

The atomic number directly tells you the number of protons. Since nickel's atomic number is 28, every nickel atom — regardless of which isotope — always has exactly 28 protons.

How to find the number of protons: • Look up the element on the periodic table • The atomic number (Z) = number of protons • Nickel: Z = 28 → 28 protons

This never changes. If the number of protons changed, it would no longer be nickel — it would be a different element entirely.

A nickel atom has three subatomic particles:

1. Protons • Number: 28 (always, in every nickel atom) • Location: inside the nucleus • Charge: +1 each → total nuclear charge = +28 • Mass: 1.673 × 10⁻²⁷ kg (≈ 1 amu) • The number of protons defines the element — 28 protons = nickel

2. Neutrons • Number: depends on the isotope • Most common isotope ⁵⁸Ni: 58 − 28 = 30 neutrons • Other isotopes: ⁶⁰Ni has 32, ⁶¹Ni has 33, ⁶²Ni has 34, ⁶⁴Ni has 36 neutrons • Location: inside the nucleus • Charge: 0 (neutral) • Mass: 1.675 × 10⁻²⁷ kg (≈ 1 amu)

3. Electrons • Number: 28 in a neutral nickel atom • Location: electron shells/orbitals around the nucleus • Charge: −1 each → total = −28 • Mass: 9.109 × 10⁻³¹ kg (negligible compared to protons/neutrons) • In ions: Ni²⁺ has 26 electrons, Ni³⁺ has 25 electrons

Charge balance in a neutral atom: 28 protons (+28) + 28 electrons (−28) = 0 net charge

Nickel (Z = 28) has 28 electrons arranged as follows:

Full electron configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s²

Shorthand (using argon core): [Ar] 3d⁸ 4s²

Shell-wise distribution: • K shell (n=1): 2 electrons • L shell (n=2): 8 electrons • M shell (n=3): 16 electrons (2 + 6 + 8) • N shell (n=4): 2 electrons • Total: 2 + 8 + 16 + 2 = 28 electrons

Valence electrons: 2 (in the 4s orbital)

Note on Ni²⁺ ion: • Ni²⁺ loses 2 electrons from the 4s orbital • Configuration of Ni²⁺: [Ar] 3d⁸ • Ni²⁺ has 26 electrons but still 28 protons • This gives it a net charge of +2

Nickel is a transition metal because it has a partially filled 3d subshell (3d⁸ — needs 10 electrons to be full).

All nickel isotopes have 28 protons but different numbers of neutrons:

Isotope | Protons | Neutrons | Mass Number | Natural Abundance ⁵⁸Ni | 28 | 30 | 58 | 68.077% ⁶⁰Ni | 28 | 32 | 60 | 26.223% ⁶¹Ni | 28 | 33 | 61 | 1.140% ⁶²Ni | 28 | 34 | 62 | 3.635% ⁶⁴Ni | 28 | 36 | 64 | 0.926%

Key points: • All five stable isotopes have exactly 28 protons — this is what makes them nickel • The number of neutrons varies: 30, 32, 33, 34, or 36 • ⁵⁸Ni is the most abundant (68.077%) • The weighted average of all isotopes gives the atomic mass: 58.693 amu • Nickel also has radioactive isotopes (e.g., ⁵⁶Ni, ⁵⁹Ni, ⁶³Ni) used in research

Formula: Number of neutrons = Mass number (A) − Atomic number (Z) For ⁵⁸Ni: Neutrons = 58 − 28 = 30

Nickel's position in the periodic table:

• Atomic number: 28 • Period: 4 (fourth row) • Group: 10 (formerly Group VIII B) • Block: d-block (transition metals) • Category: Transition metal

Neighbouring elements: • Left: Cobalt (Co, Z = 27) — 27 protons • Right: Copper (Cu, Z = 29) — 29 protons • Above: Palladium (Pd, Z = 46) in the same group • Below: Platinum (Pt, Z = 78) in the same group

Nickel belongs to the iron triad (Fe, Co, Ni) — three consecutive transition metals in Period 4 with similar properties. All three are ferromagnetic (attracted to magnets).

Group 10 elements: Ni, Pd, Pt — all are silvery metals, good catalysts, and resistant to corrosion.

Physical Properties: • Appearance: silvery-white, lustrous metal • Atomic mass: 58.693 amu • Density: 8.908 g/cm³ • Melting point: 1455°C (2651°F) • Boiling point: 2913°C (5275°F) • State at room temperature: solid • Crystal structure: face-centred cubic (FCC) • Magnetic property: ferromagnetic (one of only 4 elements that are magnetic at room temperature — Fe, Co, Ni, Gd) • Hardness: hard but malleable and ductile

Chemical Properties: • Oxidation states: +2 (most common), also +1, +3, +4 • Electronegativity: 1.91 (Pauling scale) • Ionisation energy (1st): 737.1 kJ/mol • Resists corrosion in air — forms a thin protective oxide layer • Reacts slowly with dilute acids • Does not react with water at room temperature

Uses: • Stainless steel production (65% of nickel usage) • Coins (nickel coins are 25% Ni, 75% Cu in the US) • Rechargeable batteries (NiMH, NiCd) • Electroplating (nickel plating for corrosion resistance) • Catalysts in hydrogenation reactions • Alloys: Monel, Inconel, nichrome (heating elements)

Use these simple rules to find the subatomic particles for any element:

1. Number of Protons = Atomic Number (Z) • Found on the periodic table • Example: Nickel → Z = 28 → 28 protons

2. Number of Electrons = Number of Protons (for a neutral atom) • Neutral atom has zero net charge → protons = electrons • Example: Nickel → 28 protons → 28 electrons • For ions: Ni²⁺ has 28 − 2 = 26 electrons

3. Number of Neutrons = Mass Number (A) − Atomic Number (Z) • Mass number = total protons + neutrons • Example: ⁵⁸Ni → 58 − 28 = 30 neutrons • For ⁶⁰Ni → 60 − 28 = 32 neutrons

Practice examples: • Carbon (C): Z = 6 → 6 protons, 6 electrons, 12 − 6 = 6 neutrons • Oxygen (O): Z = 8 → 8 protons, 8 electrons, 16 − 8 = 8 neutrons • Iron (Fe): Z = 26 → 26 protons, 26 electrons, 56 − 26 = 30 neutrons • Nickel (Ni): Z = 28 → 28 protons, 28 electrons, 58 − 28 = 30 neutrons • Copper (Cu): Z = 29 → 29 protons, 29 electrons, 63 − 29 = 34 neutrons