Matter and Particles Flashcards
Which subatomic particle has a negative charge?
The electron
Which subatomic particle is uncharged?
The neutron
Which subatomic particle is not found in the nucleus?
The electron
Which subatomic particle has a positive charge?
The proton
Which subatomic particle has the smallest mass?
The electron
Which subatomic particles are found in the nucleus?
Protons and neutrons
Which subatomic particles are found orbiting the nucleus?
Electrons
The ‘atomic number’ of a nucleus tells you the number of which subatomic particle?
The atomic number tells you how many protons there are in a nucleus.
(The atomic number is sometimes called the proton number)
The ‘mass number’ of a nucleus tells you the number of which subatomic particles?
The mass number tells you the total number of protons AND neutrons in the nucleus.
(The mass number is sometimes called the nucleon number)
The ‘proton number’ of a nucleus tells how many ……………. the nucleus contains. Fill in the blank.
‘protons’
The proton number is sometimes called the atomic number
The ‘nucleon number’ of a nucleus tells how many ……………………….. the nucleus contains. Fill in the blank.
protons AND neutrons
The mass number is sometimes called the nucleon number
In Thompson’s ‘plum pudding’ model, what did the dough represent?
- The positive charge of the atom,
* which he thought was very spread out.
In Thompson’s ‘plum pudding’ model, what did the ‘plums’ represent?
The negative electrons,
which he thought were embedded in the dough
Which experiment disproved Thompson’s ‘plum pudding model’?
Rutherford’s alpha particle scattering experiment
Rutherford’s alpha particle scattering experiment led to the discovery of what?
The nucleus of the atom
