Sulfur normally exists as an eight-atom molecule, S8, while phosphorus exists as a four-atom molecule, P4

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#Id: 7736

#Section 2: General Biology

The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).

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#Id: 7735

#Section 2: General Biology

The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.

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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.