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Key Questions and Terms Notes
What new scientific evidence led to changes in Dalton's atomic theory?
What did J. J. Thomson discover about electrons? Smaller negatively charged particles called electrons (originally corpuscles bc they r lil)
What was Rutherford's contribution to the structure of an atom? He discovered theres a big center and named it the nucleus and discovered in the nucleus were two protons one positive and one negative
Explain the process of how James Chadwick found the neutron. He isolated the nuetral particle and called it the nuetron.
Explain what can happen to scientific theories over time. They can be changed and added on too but are rarely discarded.
What is the structure of an atom? The structure of an atom is filled with equal protons(E) and electrons(N)An atom is composed of three different sub-atomic particles: protons, neutrons, and electrons. The protons are positively charged, and the neutrons have no charge at all
What is a proton? A proton is a positevely charged particle in the nucleus of an atom
What is a neutron? a neutral particle in the nucleus of a atom
What is an electron? A negatively charged particle that orbits the nucleus of an atom
What are the forces that exist inside an atom? Positively charged protons want to repel each other, but they are held in place by the forces in the nucleus. The nucleus of an atom is positively charged because it contains protons inside.
Explain how a neutral atom can become positively or negatively charged. Its nuetral when the negative and positives are the same but if there is more protons it becomes positive but if there is more electrons it becomes negative
What are the atomic masses of protons, neutrons, and electrons? 1 amu = 1.66 x 10−24 grams, or 0.00000000000000000000000166 grams
An amu can be used to measure a single subatomic particle or the entire mass of an atom. How is the atomic mass of an atom determined and why are electrons not used in the calculation? he mass of electrons within an atom is so small, the electrons are ignored in the total mass of an atom.
What is an amu? very small unit of measurement to represent mass of particles.
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