An ion is an atom that has gained or lost electrons. Isotopes are atoms of the same element that have different amounts of neutrons. In both ions and isotopes, the number of protons remains constant. The number of proton... More »

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The difference between atoms, ions and isotopes is the number of subatomic particles. An atom is the basic building block of matter, the smallest molecule of an element that exists and that cannot be chemically divided b... More »

The atomic number of an atom is the number of protons that resides in the nucleus, while the mass number is the number of protons and neutrons combined. The atomic number determines the type of element an atom, while the... More »

During the first two stages of photosynthesis, enzymes break up the electrons from water molecules to yield oxygen gas and hydrogen ions. When photosynthesis reaches the third stage, or Calvin cycle, enzymes assist in th... More »

The difference between atoms, ions and isotopes is the number of subatomic particles. An atom is the basic building block of matter, the smallest molecule of an element that exists and that cannot be chemically divided b... More »

A metallic bond forms when the valence electrons are not associated with a particular atom or ion. Instead, they exist as a "cloud" of electrons around the ion centers. More »

A phosphide ion is an negatively charged potassium atom that has three additional electrons in its outermost shell. Phosphide ions are nonmetallic and can chemically react with a variety of metallic elements to form ioni... More »