The noble gases are left out of the trends in atomic radii because there is great debate over the experimental values of their atomic radii.

The SI units for measuring atomic radii are the nanometer (nm) and the picometer (pm). 1 nm = 1 X 109 m; 1 pm = 1 X 10-12 m.

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#Id: 7734

#Section 2: General Biology

The number of electrons in a neutral atom is equal to the number of protons.

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#Id: 7733

#Section 2: General Biology

Atoms are made of the same three basic particles: protons, neutrons, and electrons.

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#Id: 7732

#Section 2: General Biology

Atoms are indivisible particles that can't be created or destroyed in a chemical reaction.

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#Id: 3781

#Section 2: General Biology

The multi-atom combinations are called molecules. A molecule is the smallest part of a substance that has the physical and chemical properties of that substance.

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#Id: 3778

#Section 2: General Biology

the atomic radii of chemical elements are a complicated task as the size of an atom is of the order of 1.2×10^-10m.

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#Id: 3777

#Section 2: General Biology

The diameter of the nucleus is in the range of 1.75 fm (1.75 × 10⁻¹⁵m) for hydrogen.