AQA · Chemistry · 8462
GCSE Chemistry (AQA): Development of the Periodic Table
Topic 1 — Atomic Structure & the Periodic Table. Generated from the caption track of Cognito's lesson video "GCSE Chemistry - Development of the Periodic Table (2027/28 exams)"; each card deep-links to the moment in the video it came from. Lesson 1.1 of Cognito's AQA GCSE Combined Science (Trilogy) and Chemistry course (Higher tier), filed under AQA Chemistry 8462. Teaching by Cognito — https://cognitoedu.org/coursesubtopic/c2-gcse-aqa-h-c_1.1.
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In what order are the elements arranged in the periodic table?
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In order of increasing atomic number (the number of protons).
What is a group in the periodic table?
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A vertical column of elements, which have similar chemical properties.
What are the group 1 elements called?
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The alkali metals. They all have one outer-shell electron and react violently with water.
Why do elements in the same group have similar chemical properties?
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They have the same number of electrons in their outermost shell, which largely determines how an element reacts.
How many electrons are in the outer shell of a group 2 element?
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Two — the group number gives the number of outer-shell electrons.
Why are the noble gases very unreactive?
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They have full outer shells, so they do not need to gain or lose electrons.
A horizontal row of the periodic table is called a ?.
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period
How does reactivity change going down group 1?
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The elements become more reactive as you go down the group.
Where are the non-metals found on the periodic table?
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To the right of the zig-zag line running from aluminium to polonium; the metals lie to its left.
How does reactivity change going down group 7?
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The halogens become less reactive as you go down the group.
Who devised the periodic table in the mid-19th century?
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Dmitri Mendeleev, a Russian chemist. His table also predicted elements that had not yet been discovered.
What does the mass number of an atom tell you?
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The total number of protons and neutrons in the atom.
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