The smallest unit of the element is known as
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Answer:
An atom. An atom is the smallest unit of an element that still has all the properties of that substance. In most cases, an atom consists of protons , neutrons, and electrons.
Explanation:
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Answer:
By definition, an atom. These are tiny. You can get some idea of how tiny by thinking about the radioactive source that is in most domestic smoke alarms. This is usually americium 241. It has very large atoms compared to most elements; each is about 20 times the weight of an atom of carbon. Americium does not exist in nature but is made in a nuclear reactor, so you can imagine how expensive it must be and how tiny the piece in a smoke alarm must be for the alarm to be sold at such a low price. Americium 241 has a half-life of over 400 years (after that time half the atoms have broken up, after another 400 years half the remaining ones have broken up and so on). The activity of the source in my smoke alarms is stated on the label to be 33 kilobecquerels. This means that 33000 atoms in this speck of americium break up every second. (As they do so they throw out electrically-charged sub-atomic particles that give an electrical charge to any smoke particles that are floating in the air. This causes them to be attracted to an electrode as a tiny electric current, the detection of which triggers the alarm into action). After 400 years half of the atoms will have broken up and the activity will be down to 16500 atoms breaking up every second. (Possibly the alarm ought to be replaced around this time in case it is no longer sensitive enough). You can now work out roughly how many atoms are in the tiny speck of americium that is in a new smoke alarm. The number is mind-boggling.