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Boron is in group 3 of the periodic table - Edexcel - GCSE Chemistry - Question 3 - 2018 - Paper 1
Question 3
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Boron is in group 3 of the periodic table.
(a) An atom of boron has an atomic number of 5 and a mass number of 11.
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Worked Solution & Example Answer:3
Boron is in group 3 of the periodic table - Edexcel - GCSE Chemistry - Question 3 - 2018 - Paper 1
Step 1
The number of protons in this boron atom is
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Answer
The atomic number of boron is 5, which represents the number of protons in an atom. Therefore, the correct answer is B 5.
Step 2
The number of neutrons in this boron atom is
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Answer
The number of neutrons can be calculated using the formula: Number of Neutrons = Mass Number - Atomic Number. For boron, this gives: 11 - 5 = 6. Hence, the correct answer is B 6.
Step 3
The number of electrons in the outer shell of a boron atom is
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Answer
In a neutral atom, the number of electrons is equal to the number of protons. Since boron has 5 protons, it will also have 5 electrons. However, the number of electrons in the outer shell, which is directly related to the valence electrons, is 3. Therefore, the correct answer is A 3.
