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Slide 2

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LEARNING OBJECTIVES:
· To learn about atomic structure and periods
· To learn about electron arrangement and groups…read more

Slide 3

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PERIODS
These are horizontal rows in the periodic table
From one atom to the next, the proton number increased
by one and the number of electrons increases by one.
So, the electron shells fill up progressively.…read more

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GROUPS
These are vertical columns in the periodic table
For elements in groups 1-7, the number of electrons in the
outer shell of the element is the same as its group number.…read more

Slide 5

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SUMMARY
· In a modern periodic table, atoms are arranged by
proton number
· Each electron shell fills up across a period in the periodic
table
· The number of electrons in the outer shell of an atom is
the same as the group number…read more

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