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Jugadas 25

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Atom Note SummaryVersión en línea

Practice filling in the blanks.

por Anne Dieter
1

The idea of the atom began over 2 , 000 years ago with early Greek . proposed that all matter is made of tiny , indivisible particles he called , a word meaning " uncuttable . " His ideas were based purely on rather than experiments . , another influential Greek philosopher , argued instead that matter was continuous and could be divided forever . Although Aristotle ? s idea was , it was widely for nearly two millennia because of his authority and influence .

2

In the 1800s , scientists began conducting that led to the first scientific atomic . These models changed dramatically over time as new discoveries were made , especially with the development of better . Each atomic model had its and , but together they helped shape modern understanding . As scientists studied atoms , they needed a way to measure their extremely small masses , so they developed the ( amu ) . One is defined as 1 / 12 the mass of a - 12 atom and is used to describe masses of atoms and subatomic particles .

3

The most recent and widely accepted atomic model is called the . This model shows that all atoms have a dense in the and an electron surrounding it . Inside these regions are , the smaller particles that make up atoms . Protons and neutrons are located in the and each has a mass of about amu . Protons have a charge and neutrons have no . Electrons , which are charged , move rapidly within the electron cloud and have extremely small , about 1 / 12 amu , which is essentially for most calculations .

4

The electron cloud is mostly empty space , and move within it . areas represent places where electrons spend most of their time , while areas show less frequent locations . If the nucleus were the size of a pencil in the center of a , the electrons would be found near the stadium's highest .

5

Each is identified by its , which is the number of in its nucleus . In a neutral atom , the number of protons equals the number of . Atoms of the same element can have different numbers of , called . For example , carbon has isotopes such as carbon - 12 ( 6 neutrons ) , carbon - 13 ( 7 neutrons ) , and carbon - 14 ( 8 neutrons ) . The atomic listed on the periodic table is the weighted of all naturally occurring isotopes of an element .

6

The of an atom is the total number of protons and neutrons in its nucleus . It is always a because you cannot have of a proton or neutron . are not included in the mass number because their mass is so .

Quick Guide to Fining the Number of Protons , Neutrons , and Electrons .
Atomic number =
Protons = ( in a neutral atom )
= mass number ? atomic number .

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