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100
Why did Mendeleev leave gaps in the periodic table?
Because he knew that other elements would be discovered
100
How are the elements in the modern periodic table arranged?
They are arranged by increasing mass number
100
What group of elements is least reactive
Noble Gases
100
How many protons, neutrons, and electrons are in Si
14 Protons 14 Electrons 14 Neutrons
100
How many protons, neutrons, and electrons are in H
1 proton 1 electron 1 neutron
200
How did Mendeleev organize the periodic table of elements?
He organized them by increasing mass number
200
How many periods are in the periodic table
7
200
Explain why elements in a group have similar properties
They have similar properties because they have the same number of valence electrons
200
How many protons, neutrons and electrons are in Br
35 Protons 35 Electrons 45 Neutrons
200
How many protons, neutrons, and electrons are in Ti
22 Protons 22 Electrons 25 or 26 Neutrons
300
Name the 3 categories that are used to classify elements on the periodic table.
Metals, Nonmetals, and Transition Metals
300
Copper is an example of what?
A metal
300
What are the most reactive elements on the periodic table?
Alkali Metals
300
How many protons, neutrons, and electrons are in Pb
82 Protons 82 Electrons 125 Neutrons
300
What kind of charge does an electron have?
a negative charge
400
What major change occurs as you move from left to right across the periodic table?
The elements become less metallic as you go from left to right
400
What element exists in almost every compound in our body
Carbon
400
Why is chlorine added to drinking water?
To kill bacteria
400
How many protons, neutrons, and electrons are in Ge
32 Protons 32 Electrons 50 or 51 Neutrons
400
What type of charge does an neutron have
It has no charge
500
How many protons, neutrons, and electrons are in Fm
100 Protons 100 Electrons 157 Neutrons
500
How many protons, neutrons, and electrons are in Yb
70 Protons 70 Electrons 103 Neutrons
500
How many protons, neutrons, and electrons are in Hs
108 Protons 108 Electrons 157 Neutrons
500
How many protons, neutrons, and electrons are in Dy?
66 Protons 66 Electrons 96 Neutrons
500
What kind of charge does a proton have
It has a positive charge
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