Chapter 2 - keywords

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9 Terms

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Atomic number

No. of protons in the nucleus of an atom.

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Mass number

Sum of the no. of protons + neutrons in the nucleus (nucleon no.)

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Isotope

Atoms of the same element w/different no. of neutrons and different masses.

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Ion

A +tively/-tively charged atom/particle or a (covalently bonded) group of atoms (a polyatomic ion) where the no. of electrons is different from the no. of protons.

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Relative Atomic mass

The weighted mean mass of an atom of an element compared to 1/12th of the mass of a carbon-12 atom.

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Relative formula mass

The weighted mean mass of the formula unit of a compound compared w/ 1/12th of the mass of an atom of carbon-12.

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Relative Isotopic mass

The mass of an atom of an isotope compared w/ 1/12th of the mass of an atom of carbon-12.

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Binary compound

a compound containing 2 elements only.

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Polyatomic Ion

Ion containing more than 1 atom.