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- 1. Multiple Choice
Before Mendeleev's table, how were elements arranged in order to classify them?
In order of atomic mass
In order of atomic weight
By physical and chemical properties
They weren't
- 2. Multiple Choice
What were some problems with the early versions of the periodic table?
Some elements had not been discovered so the tables were not complete.
The elements did not follow a regular pattern.
The weight of some elements had been calculated incorrectly.
Elements were placed in order of atomic weight, so some ended up in the wrong group.
- 3. Fill in the Blank
In the periodic table, the ______ number tells us the number of electron shells in an atom.
- 4. Multiple Choice
How did Mendeleev overcome some of the problems in his version of the periodic table?
He made up new elements to fill in gaps.
He left gaps for undiscovered elements.
He ordered the elements in terms of atomic mass.
He placed elements in groups according to similar properties.
- 5. Fill in the Blank
Placing the elements in order of atomic weight was incorrect because some elements have ________ that have different masses.
- 6. Fill in the Blank
In the periodic table, the _____ number tells us the number of electrons in the outer shell of an atom.
- 7. Fill in the Blank
Bromine is in Group 7. How many electrons are in the outer shell of a bromine atom?
- 8. Multiple Choice
An atom of sodium has 3 electron shells. What does this tell us about the atom?
It is in Group 3 of the periodic table
It is in Period 3 of the periodic table
It has 3 electrons
Molecules of sodium contain 3 atoms
- 9. Multiple Choice
Magnesium is in Group 3 and Period 2. What is the electronic structure of magnesium?
1.1.1
3.2
2.8.2
2.8.8
- 10. Fill in the Blank
An element is in Group 6 and Period 3. How many electrons does it have in total?
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