physics igsce
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14 Terms
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explain the obervsation on expirment : most of the particles pass straight forward with no deviation
most of the atom is empty space
explain from expirment: why some alpha particles are deviated with angle with greater than 90°
the nucleus is heavy and tiny and is postively charged
explain from expirment: Some alpha particles are deviated with angle less than 90°
The nucleus is postively charged so postive alpha particles get repelled
what's inside the nucleus ? whats outside the nucleus?
What are Isotopes?
Atoms of the same element with same number of protons but differnt number of neutrons. they are either stable or radiactive
Number of neutrons=
mass number - atomic number
whats the charge of an atom?
the atom is neutral
what particles were scattered in the gold foil experiment?
alpha particles
which observation provides evidence for the nuclear atom?
a-attraction of positive charges
b-emission of gamma rays by a thin metal foil
c-scattering of alpha particles by a thin metal foil
c-scattering of alpha particles by a thin metal foil
When a thin gold foil is bombarded with alpha particles, some alpha particles are deflected through large angles.When a thin gold foil is bombarded with alpha particles, some alpha particles are deflected through large angles.
Which statement explains this deflection?
A- Most of the atom consists of atom is empty space
b- All of the positive charge and most of the mass of the gold atom are concentrated in a small volume.
c- all negative charge is concentrated at its centre.
B - All of the positive charge and most of the mass of the gold atom are concentrated in a small volume.
a- A nucelus with 92 protons and 143 neutrons inside the nucelus, nucleus surounded by 92 electrons
b- Uranium-238 has 3 more neutrins then Uranium-235
only what isotope of gold exiists on earth explain what this indicates about the nuclear structure of all naturally occuring gold atoms on earth
they all have same number of protons and neutrons
what makes an element Radioactive?
when it has excess neutrons that make it too heavy,