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15
×
Which group of elements do not form ions?
Noble gases (group 18)
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thief
Give points!
5
10
15
20
25
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fairy
Take points!
5
10
15
20
25
×
shark
Other team loses 10 points!
Okay!
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banana
Go to last place!
Oops!
15
×
What is the outermost layer occupied by electrons called?
The valence layer
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baam
Lose 25 points!
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shark
Other team loses 20 points!
Okay!
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rocket
Go to first place!
Okay!
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banana
Go to last place!
Oops!
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seesaw
Swap points!
Oops!
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star
Double points!
Okay!
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shark
Other team loses 25 points!
Okay!
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baam
Lose 20 points!
Oops!
15
×
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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15
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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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15
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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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15
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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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15
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in 1817, what did DobÃŦreiner classify the elemets based on?
Their atomic mass
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15
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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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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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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 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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15
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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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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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