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An atom’s nucleus occupies very little of the atom’s volume but contains most of its mass (D)
An atom is the smallest material consisting of a nucleus, which contains protons, neutrons, and electrons that surround it
The Atomic Number (Z) indicates the number of protons in an atom of an element.
Protons are positively charged (+1), electrons are negatively charged (-1). and neutrons are uncharged (neutral)
While the mass of 1 proton is equal to the mass of 1 neutron, equal to 1 amu and the electron has a mass smaller than both.
The hydrogen atom is the lightest atom whose mass is 1.67 x 10⁻²⁷kg (measured using a mass spectrometer) and simplified to 1 amu (atomic mass unit).
1 amu = 1,66.10⁻²⁴ grams
The mass of each basic particle :
From the Rutherford atomic model, protons are located in the nucleus and negatively charged electrons around the nucleus.
From this atomic model, it shows the most of the volume of atoms filled by electrons and between atomic nuclei and electrons is empty space
According to the latest atomic model, the atomic nucleus is surrounded by fog/cloud of electrons.
Because the nucleus consists of protons and neutrons,which is both mass greater than electrons, so the center of mass of the atom is located in the nucleus
While the atomic volume is filled more by the fog/cloud of electrons.
The combination of atoms during chemical reactions
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The difference between a calcium atom and a calcium ion
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A carbon atom
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