Boron exists as two isotopes - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Question 6
Boron exists as two isotopes.
These are boron-10,
^10B, and boron-11,
^11B.
(a) The diagram shows an atom of the isotope, boron-10.
(i) State the electronic con... show full transcript
Worked Solution & Example Answer:Boron exists as two isotopes - Edexcel - GCSE Chemistry - Question 6 - 2013 - Paper 1
Step 1
State the electronic configuration of boron.
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Answer
The electronic configuration of boron (atomic number 5) is given by the distribution of electrons in the energy levels. For boron, it is represented as:
1s22s22p1
This indicates that there are 2 electrons in the first energy level (1s) and 3 electrons in the second energy level (2s and 2p).
Step 2
Complete the sentence by putting a cross (X) in the box next to your answer.
In the periodic table, boron is in period.
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Answer
B
Boron is in period 2 of the periodic table, as it is located in the second row.
Step 3
Complete the table.
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