11 mark
The diagram shows the electron structures of some elements.
Which two elements have similar chemical properties?
| ☐ | A | A and B | |
| ☐ | B | A and C | |
| ☐ | C | B and C | |
| ☐ | D | B and D |
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The Periodic Table (Edexcel GCSE Chemistry: Combined Science)
Exam Questions
1 hour15 questions2a3 marks
In Figure 8, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table.
These letters are not the symbols of the atoms of these elements.
Figure 8
Using the letters A, E, G, J, X and Z
i)
give the letters of the two elements that are non-metals
(1)
ii)
give the letters of two elements in period 2
(1)
iii)
give the letter of an element that normally forms an ion with a charge of +1.
(1)
2b3 marks
Element E has an atomic number of 5.
In a sample of E there are two isotopes. One isotope has a mass number of 10 and the other isotope has a mass number of 11.
i)
Explain, in terms of subatomic particles, what is meant by the term isotopes.
(2)
ii)
All atoms of element E in this sample contain
(1)
2c1 mark
Element X has an atomic number of 18.
State the electronic configuration of an atom of element X.
2d
3 marks
3 marksIn an experiment, 3.5 g of element A reacted with 4.0 g of element G to form a compound.
Calculate the empirical formula of this compound.
(relative atomic masses: A = 7, G = 16)
You must show your working.
empirical formula of this compound=...........................
2e2 marks
An oxygen atom has six electrons in its outer shell.
A hydrogen atom has one electron in its outer shell.
Complete the dot and cross diagram of a molecule of water, H2O.
Show outer shell electrons only.
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31 mark
An element has the configuration 2.8.3.
Which group and period is this element in?
| Group | Period | |||
| ☐ | A | 2 | 8 | |
| ☐ | B | 3 | 3 | |
| ☐ | C | 2 | 3 | |
| ☐ | D | 3 | 2 |
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41 mark
Mendeleev arranged the elements in order of atomic mass.
He then reversed the order of some pairs of elements.
Why did he do this?
| ☐ | A | To put them in order of atomic number | |
| ☐ | B | To group elements according to their properties | |
| ☐ | C | To leave gaps for undiscovered elements | |
| ☐ | D | To ensure elements were in the same period |
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5a1 mark
Figure 1 below shows the periodic table Mendeleev produced in 1869.
His periodic table was more widely accepted than previous versions
Figure 1
The atomic weight of iodine (I) is 127 and that of tellurium (Te) is 128.
Why did Mendeleev reverse the order of these two elements?
5b1 mark
Why did Mendeleev leave gaps for undiscovered elements?
5c1 mark
Name the particle that allowed the elements to be arranged in order of their atomic number in the modern Periodic Table.
5d4 marks
Mendeleev's periodic table shows lithium, sodium and potassium all in the same column.
These elements are in the same column, Group 1, of the modern periodic table.
Explain the reactivity of these elements going down Group 1.
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