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Characteristics of Subatomic Particles

# Characteristics of Subatomic Particles - same charge(both...

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Characteristics of Subatomic Particles The mass of subatomic particles is too small to be conveniently measured in grams so atomic mass units (amu) are used instead. Atomic mass units are also called daltons. One amu (or dalton) is approximately 1.7 X 10 -24 g. Protons and neutrons have a mass of approximately 1 amu. The mass of an electron is much less. The total mass of an atom is due mostly to the mass of protons and neutrons. mass charge protons approx. 1 amu + neutrons approx. 1 amu 0 electrons 1/1836 amu - Charge is a state in which particles are either attracted to each other or they repel each other. Two particles that are attracted to each other have opposite charges (positive and negative). Particles that repel each other have the same charge; they are both either positive or they are both negative. Protons have a positive charge and electrons have a negative charge. Particles with positive charges are attracted to particles with negative charges. Two particles with the
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Unformatted text preview: same charge (both positive or both negative) will repel each other. Atoms are neutral. The number of electrons (negatively charged) is equal to the number of protons (positively charged), therefore the overall charge is zero. Atomic Mass and Mass Number The atomic mass is calculated as the sum of the mass of protons, electrons, and neutrons. The mass of electrons is small enough that we can generally disregard it in our calculations of atomic mass. The mass number is the number of protons and neutrons. Most of an atom is empty space. Atomic Number The atomic number is the number of protons. All atoms of an element have the same atomic number. The number of protons contributes to the physical properties of an element. Atoms are neutral, therefore the number of electrons is equal to the number of protons....
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