Atomic Structure
What are the three main subatomic particles in an atom?
Protons, neutrons and electrons
What is the central part of an atom called?
nucleus
What is the charge of an alpha particle?
+2
Define isotopes.
Atoms with the same number of protons but different numbers of neutrons
What is nuclear fission?
splitting if a heavy unstable nucleus
Which subatomic particle has a relative charge of −1?
electrons
What comes once in a minute, twice in a moment, but never in a thousand years?
M
What happened to most alpha particles when they passed through the foil?
they went undeviated
Carbon-12 and carbon-14 have the same number of which subatomic particles?
protons
what is nuclear fusion
Which particles are found inside the nucleus?
protons and neutrons
what is meant by nucleon number
the total number of protons and neutrons in an atom
Why were some alpha particles deflected through large angles?
because the nucleus is positively charged
During which month do people sleep the least?
February
which nuclear process release energy in stars
fission
An atom contains 11 protons, 12 neutrons and 11 electrons. What is its mass number?
23
147N represents the nitrogen atom. state the number of protons, electrons and neutrons in it
P - 7
e - 7
n -7
What conclusion did Rutherford make when a very small number of alpha particles bounced back?
the nucleus is too small and dense
examples of isotopes of any element
any correct annswer
nuclear reactor works with which nuclear reaction
fission
What word is always spelled wrong in the dictionary?
wrong
what is binding energy
the energy which hold the particles in the nucleus
OR
Nuclear binding energy is the energy required to separate a nucleus completely into its individual protons and neutrons.
True or False
Mathew is very interested to study physics
its a free 500 mark
Explain why isotopes of the same element have the same chemical properties.
they have same number of electrons
State the reason..
why Kailash always feels sleepy during physics lesson
its a free mark - but not 500 only 300