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20 Cards in this Set

  • Front
  • Back
What is at the centre of an atom?
The nucleus.
What does the nucleus contain?
Neutrons
Protons
What is the overall charge of the nucleus?
Positive
What is the charge of the protons in the nucleus?
+1
The neutrons in the nucleus have a similar mass to the protons but they are .....
uncharged
The volume occupied by the orbits of the electrons determines the ..... of the ....
size
atom
The overall charge of an an atom is ......
zero
If an atom loses or gains electrons it becomes ......
charged
Charged particles are called?
Ions
The atomic number of an element is given the symbol?
Z
What is the atomic number sometimes called?
Proton number.
What symbol is given to the mass number?
A
What does the mass number represent?
Total number of neutrons and protons in the nucleus.
What is an isotope?
An atom with same no of protons, but different no of neutrons.
Electrons orbit the nucleus in ...... ....... also called ......
energy levels
shells
The first shell contains how many electrons?
2
The second shell contains up to how many electrons?
8
Electrons are ...... and ...... charged.
tiny
negatively
Protons are ..... and ..... charged.
heavy
positively
Neutrons are ...... and .....
heavy
neutral