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Who developed was the first person credited with arranging the elements in a certain order?
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
Each horizontal row of elements is called a _________________.
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
All _____________ have 2 electrons in their outer energy level.
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
Who arranged the elements by increasing atomic number?
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
Which category of elements are ductile and malleable?
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
Each vertical column of elements is called a _______________.
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
Repeating patterns that occur at regular intervals are referred to as ________________.
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
Group 1 elements are also known as the ______________________metals.
group
Alkali
Group 2
Dmitri Mendeleev
Metals
periodic
period
Henry Mosely
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