The Atom (development, Structure, Particles Etc).
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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what is the charge of a proton
+1
why do atoms have no overall charge
they have an equal number of protons + electrons
what is the charge of an electron
-1
what is the charge of a neutron
0 (NEUTron)
what does the atomic number tell us on the periodic table
the number of protons (same number of electrons)
what is an isotope
atoms of the same element with a different number of neutrons but the same number of protons and electrons
what is the relative mass of a neutron
1
what does the atomic mass tell us about an atom
the number of protons and neutrons combined
What was John Daltons interpretation of the atom
A solid sphere that couldn’t be divided into smaller parts
What did John dalton’s atom model NOT include
Protons neutrons and electrons
Scientists’ experiments resulted in the discovery of….
Sub-atomic charged particles
What was the first sub-atomic charged particle to be discovered
Electrons - tiny negatively charged particles
What did the discovery of electrons lead to
The plum pudding model
What is the plum pudding model
A cloud of positive charge, with negative electrons embedded in it.
What was the alpha scattering experiment
Where scientists fired small, positively charged particles at an incredibly thin piece of gold foil
What did scientists expect from the alpha scattering experiment
They expected the alpha particles to travel straight through the thin gold
What did the charged particles do in the alpha scattering experiment
Bounced back and many were deflected
What was the scientists explanation to why the particles in the alpha scattering experiment were repelled?
The positive charge and mass of the atom must be concentrated at a small space in the centre. They called this the nucleus
What was the plum pudding model replaced by
The nuclear model
What is the nuclear model
The scientists suggested that the electrons orbit the nucleus, but not at set distances.
What did Neils Bohr calculate
Electrons must orbit (go around) the nucleus at fixed distances
A proton has an __________ ________ to an electron
Opposite charge
Who carried out experiments that gave evidence for a particle with no charge
James Chadwick
What is one property of protons, neutrons and electrons?
Relative masses compared to one another