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15
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Why did Mendeleen call it the "Periodic table of elements"?
Becase the properties of the elements were repeated at a certain frequnecy.
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banana
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gift
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rocket
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lifesaver
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15
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What are the elements in group 17 called? How many electrons do they have in the outer layer?
Haolgens. They have 7 electrons in the outer layer.
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Why did Mendeleen leave gaps in the table?
He assumed other elements were yet to be discocvered
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Why is hydrogen the first element on the periodic table?
Because it only has one proton and one electron
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How many rows are there in the periodic table? (don't look!) What are the rows called?
There are 7 rows and they are called periods
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eraser
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magnet
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What do elements that are classified as metals tend to do in regards to electrons and ions? (gain, lose...)
Metals tend to lose electrons and form positive ions
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What is the outermost layer occupied by electrons called?
The valence layer
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Which group of elements do not form ions?
Noble gases (group 18)
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What do all the elements in a column (group) have in common?
They all have the same number of electrons in their outer layer
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Who publised the first table of chemcical elements?
Mendeleev
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What do the elements in a row have in common?
They have the same number of of layers of electrons
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banana
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In the current periodic table, the chemical elemets are organized in ascending order according to what?
Their atomic number
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How did Henry Moseley organize elements on the period table? (The same way that they are organized now)
Based on their number of protons
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