In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2019 - Paper 1
Question 5
In Figure 5, 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 elemen... show full transcript
Worked Solution & Example Answer:In Figure 5, the letters A, E, G, J, X and Z show the positions of six elements in the periodic table - Edexcel - GCSE Chemistry Combined Science - Question 5 - 2019 - Paper 1
Step 1
Using the letters A, E, G, J and Z
(i) give the letters of the two elements that are non-metals
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Answer
The non-metals represented in Figure 5 are E and X.
Step 2
Using the letters A, E, G, J and Z
(ii) give the letters of two elements in period 2
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Answer
The elements in period 2 are E and G.
Step 3
Using the letters A, E, G, J and Z
(iii) give the letter of an element that normally forms an ion with a charge of +1
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Answer
Element J typically forms an ion with a charge of +1.
Step 4
All atoms of element E in this sample contain
A 5 protons
B 5 neutrons
C 6 protons
D 6 neutrons
(iv) All atoms of element E in this sample contain
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Answer
The correct option is A: 5 protons, as this identifies element E as boron.
Step 5
Element X has an atomic number of 18.
State the electronic configuration of an atom of element X.
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Answer
The electronic configuration of element X is 2.8.8.
Step 6
In 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.
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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.
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Answer
The dot and cross diagram for water (H2O) shows the oxygen atom with six outer shell electrons (represented as dots) and two hydrogen atoms each contributing one electron (represented as crosses). This illustrates the shared electrons in covalent bonds.
