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15
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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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15
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What are the elemets in group 1 called? How many electrons do they have in the outer layer?
Alkali metals. They have 1 electron in the outer layer.
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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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What is the outermost layer occupied by electrons called?
The valence layer
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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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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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in 1817, what did DobÃŦreiner classify the elemets based on?
Their atomic mass
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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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seesaw
Swap points!
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gift
Win 15 points!
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gift
Win 10 points!
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thief
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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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Who publised the first table of chemcical elements?
Mendeleev
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lifesaver
Give 20 points!
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rocket
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fairy
Take points!
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thief
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banana
Go to last place!
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gift
Win 25 points!
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rocket
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thief
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25
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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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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How many columns are there? What are the columns called?
There are 18 colums and they are called groups.
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