How are elements ordered in the periodic table?
By increasing atomic number.
AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher · 5.1.2.1
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How are elements ordered in the periodic table?
By increasing atomic number.
What is an element’s atomic number?
The number of protons in its nucleus.
How does the number of electrons in a neutral atom relate to its atomic number?
They are equal.
What happens to electron structures as atomic number increases across the periodic table?
Patterns in electron structure repeat.
Why is the periodic table called periodic?
Similar chemical properties recur at regular intervals.
What is a group in the periodic table?
A vertical column of elements.
What do elements in the same group have in common in their electron structure?
They have the same number of outer-shell electrons.
Why do elements in the same group tend to have similar chemical properties?
They have the same number of outer-shell electrons, which are mainly involved in chemical reactions.
What do elements in the same group have in common about their outer-shell electrons?
They have the same number of outer-shell electrons.
Why do elements in the same group tend to have similar chemical properties?
They have the same number of outer-shell electrons, which determine how atoms take part in chemical reactions.
For elements in Groups I to VII, how does the group number relate to the number of outer-shell electrons?
The group number equals the number of outer-shell electrons.
What characterises the outer shells of Group VIII noble gases among the first 20 elements?
They are full: helium has 2 outer-shell electrons; the others have 8.
How does an element’s period number relate to its occupied electron shells?
The period number equals the number of occupied electron shells.