The Periodic Table Y9
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How are elements arranged in periodic table
Increasing atomic numbers
What is atomic number
Number of protons in the nucleus
What is a period
Horizontal row
What is a group
Vertical column
Why does the atomic number decide an elements position in the periodic table
Shows how many electrons element had so determines its electron configuration and chemical properties
What does period number tell you
How many electron shells element has
What do elements in the same group have in common
Same number of outer shell electrons
How does atomic number change across a period?
Increases by one for each element
How do properties change across a period?
Reactivity, metallic character, and ionisation energy gradually change from left or right
Why do elements in a group react similarly?
Same number of outer electrons meaning similar bonding and reactions
Why don’t elements in the same period? Have identical properties?
They have the same number of electron shells, but increasing outer electrons. So gradual changing properties.
Which elements are in period one of the periodic table?
Hydrogen and helium
What is the max electrons in each shell
2,8,8,8
Label metal and non metal on periodic table
Ok
How is electron configuration linked to group number?
Group number equals number of outer electrons
Why do elements in the same group have similar chemical properties?
Same amount of outer electrons so react the same
Why are metals on the left of the periodic table?
They have a few outer electrons and lose them easily
Why are nonmetals on the right of the periodic table?
Have nearly full outer shells and gained electrons
Where are the noble gases found in the periodic table?
Group 0 (furthest right column)
What is the electron configuration of noble gases?
They all have full outer shells
Why does a full outer shell make noble gases stable?
No need to gain lose or share electrons
Do noble gases form ions easily?
No, because they are already stable
Do noble gases formed bonds easily?
No, because they don’t need to share electrons