1.10 The modern periodic table
6 exam questions worth 12 marks. Write your answer, open the mark scheme, then give yourself the marks you earned. Your answers are saved on this device.
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In what order are the elements arranged in the modern periodic table?
Choose one answer.
Correct Not quite: the answer is Increasing atomic number
Mark scheme
B
Model answer
B: elements are in order of increasing atomic number (number of protons).
Magnesium has the electronic structure 2.8.2.
Give the group and the period of magnesium. Explain your answers.
Mark scheme
- Group 2, because it has 2 outer electrons (1)
- Period 3, because it has 3 occupied shells (1)
Model answer
Magnesium is in Group 2 because it has 2 electrons in its outer shell, and in Period 3 because it has 3 occupied shells.
Explain why lithium and sodium have similar chemical reactions.
Mark scheme
- both have 1 electron in the outer shell / same number of outer electrons (1)
- reactions involve the outer electrons (1)
Model answer
Both atoms have one electron in their outer shell, and chemical reactions involve the outer electrons, so they react in similar ways.
Element X is a dull solid with a low melting point. It does not conduct electricity and is brittle.
Is X a metal or a non-metal? Give two reasons from the description.
Mark scheme
- non-metal (1)
- any two from: dull, low melting point, does not conduct electricity, brittle (2)
Model answer
X is a non-metal: it is dull, it does not conduct electricity, it has a low melting point and it is brittle.
Explain, in terms of electrons, why the elements on the left of the periodic table are metals.
Mark scheme
- atoms have few outer electrons (1, 2 or 3) (1)
- they lose these electrons to form positive ions (1)
Model answer
Their atoms have only 1, 2 or 3 outer electrons, which they lose to form positive ions, which is how metals react.
An element is in Group 6 and Period 2 of the periodic table.
Write its electronic structure and name the element.
Mark scheme
- 2.6 (1)
- oxygen (1)
Model answer
Period 2 means two shells and Group 6 means six outer electrons, so it is 2.6, which is oxygen.
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