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Solnce55 [7]
3 years ago
14

The noble gases are an example of a ______ of elements. period family table

Chemistry
1 answer:
Mariulka [41]3 years ago
5 0
Periodic table of elements
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Which two subatomic particles have the greatest mass?
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PROTON AND NEUTRON

Explanation:

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A proton is one of the main particles that make up the atom . The other two particles are neutron and electron. Protons are found in the nucleus of the atom.This is a tiny , dense region at the centre of the atom. Protons have a positive charge of one (+1) and a mass of 1 atomic mass unit ( amu ) , which is about 1.67*10^{-27}kg. Together with neutrons , they make up virtually all of the mass of an atom.

  • The  mass of neutron is also approximately: 1.67*10^{-27}kg but a little more than that .

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3 years ago
Which element, represented by X, reacts with oxygen to produce the compound X2O?
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Which concept does the diagram show?
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