The mass of an electron is <u>C. not significant to the overall mass of the atom</u>
<h3>Further explanation</h3>
Atoms are composed of 3 types of basic particles namely protons, electrons, and neutrons
The charge of 1 proton is equal to a charge of 1 electron but has a different sign
The proton is positively charged (+1), the electron is negatively charged (-1). and neutrons not charged (neutral)
For a charge of 1 electron = e = 1.66.10⁻¹⁹ coulomb
Whereas the neutron charge = 0
The mass of this basic particle is expressed in atomic mass units
This atomic unit uses the standard atomic mass, that is, the C-12 isotope
1 atom C-12 = 12 atomic mass units
1 atomic mass unit = 1/12 x 1 C-12 atomic mass
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 in atomic mass units is:
- electron mass = 9.11.10⁻²⁸
- proton mass = 1.6726.10⁻²⁴
- neutron mass = 1,675.10⁻²⁴
The proton mass is considered to be equal to 1 atomic mass unit and a neutron which is also considered to be equal to 1 atomic mass unit
So if we look at the numbers above, it shows that the electron mass is smaller than the proton mass and neutron mass, and not significant to the overall mass of the atom
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