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Who said that "the positive charge of atoms in concentrated in a tiny central area"?
Rutherford
Who said that "electrons can only occupy certain orbits in the atomic shell"?
Niels Bohr
That is the distribution of electrons in the 3rd level?
2 6 10
Is C-14 a radioactive isotope?
True
True or false: Stable isotopes break up over time emitting particles or electromagnetic radiation.
True
True or false: Isotopes can be stable and unstable.
True
True or false: Are the atoms X (6 protons and 6 neutrons) and Y (7 protons and 5 neutrons) the same element?
False
True or false: Atoms X (Z=19 A=40) and Y (Z=20 A=40) are isotopes.
False
True or false: Atoms X (Z=20 A=40) and Y (Z=20 A=41) are isotopes.
True
What is the maximum number of electrons in a p sublevel?
6
What is the maximum number of electrons in the 4th level?
32
What letters represent the different energy sublevels in an atom?
s, p, d, f, g
The electrons fill the levels and sublevels, starting with the level .... (closest/furthest) to the nucleus.
Closest
True or false: The electron configuration for silicon (Z=14) is 1s2 2s2 2p6 3s1 3p1
False
In which sublevel is the last electron of a calcium atom (Z=20)?
3p
Do neutrons have an electric charge?
no, they don't
Almost all the mass of the atom is in the _________? (in Rutherford's model)
nucleus
Describe the planetary model.
describe
Rutherford's atomic model is usually known as ...?
the planetary model
What can you find inside the atom, between the nucleus and the electrons? (in Rutherford's model)
nothing, that space is empty
In Rutherford's atomic model, the electrons are _______ing around the nucleus.
orbit(ing)
What did Rutherford call the centre of the atom?
a nucleus
In Rutherford's model, where are the protons, neutrons and electrons?
Protons and neutrons in the centre, electrons outside
When an atom has less electrons that protons, it is called a __________?
cation
When an atom has more electrons than protons, it is called an ________
anion
Can some atoms have more electrons than protons?
Yes
Thomson said that atoms are neutral because ...?
the number of positive protons is equal to the number of negative electrons
Describe Daltons atomic model
He thought that atoms are tiny hard spheres
Did Dalton use the scientific method to study atoms?
Yes
Compounds are always made up of atoms of the same element?
No, for example H2O
Dalton said that atoms of different elements can come together to form _________
compounds
Dalton believed that matter is made up of indivisible particles that cannot be _________
destroyed
Dalton believed that atoms of the same element were all the same. In what way are they the same?
They have the same mass, size and properties
Who was the first person to study atoms using the scientific method?
Dalton
Did Dalton believe that atoms were soft like pudding or hard little balls?
He believed that they were tiny hard spheres
The symbol for the mass number is ...
A
The symbol for the atomic number is ...
Z
The atomic number is the total number of ...?
protons in an atom
The mass number is the total number of ...?
protons AND neutrons added together
Inside the nucleus of an atom, you will find ...?
neutrons and protons
What is the electric charge of electrons?
negative charge
Protons have the same mass as ...?
neutrons
What did Democritus think the world was made up of?
small particles called atoms
Where was Democritus from?
Ancient Greece
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