Distinguish
between
Metal
and
Isotopes ?
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Let's imagine a pair of identical twins. These twins have the same temperament, and since they're identical, it is very hard to tell them apart unless you examine them closely. When it is time for their annual physical, the twins need to step on a weighing scale, and when they do, one weighs slightly more than the other. In terms of chemistry, we can say that these twins are like isotopes of each other.
Atoms and elements are made of protons, neutrons and electrons. The nucleus is made of protons and neutrons, and the electrons surround the nucleus, as shown in the illustration below. The sum of the number of protons and the number of neutrons is equal to the atomic mass.
Most metals are hard, shiny, they feel heavy and they melt only when they are heated at very high temperatures . Lumps of metal will make a bell-like sound when they are hit with something heavy (they are sonorous). Heat and electricity can easily pass through a metal (it is conductive). A lump of metal can be beaten into a thin sheet (it is malleable) or can be pulled into thin wires (it is ductile). Metal is hard to pull apart (it has a high tensile strength) or smash (it has a high compressive strength). If you push on a long, thin piece of metal, it will bend, not break (it is elastic). Except for cesium, copper, and gold, metals have a neutral, silvery color.
Not all metals have these properties. Mercury, for instance, is liquid at room temperature, Lead, is very soft, and heat and electricity do not pass through iron as well as they do through copper.
Atoms and elements are made of protons, neutrons and electrons. The nucleus is made of protons and neutrons, and the electrons surround the nucleus, as shown in the illustration below. The sum of the number of protons and the number of neutrons is equal to the atomic mass.
Most metals are hard, shiny, they feel heavy and they melt only when they are heated at very high temperatures . Lumps of metal will make a bell-like sound when they are hit with something heavy (they are sonorous). Heat and electricity can easily pass through a metal (it is conductive). A lump of metal can be beaten into a thin sheet (it is malleable) or can be pulled into thin wires (it is ductile). Metal is hard to pull apart (it has a high tensile strength) or smash (it has a high compressive strength). If you push on a long, thin piece of metal, it will bend, not break (it is elastic). Except for cesium, copper, and gold, metals have a neutral, silvery color.
Not all metals have these properties. Mercury, for instance, is liquid at room temperature, Lead, is very soft, and heat and electricity do not pass through iron as well as they do through copper.
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