This question is about atomic structure and elements - AQA - GCSE Chemistry - Question 1 - 2015 - Paper 1
Question 1
This question is about atomic structure and elements.
1 (a) Complete the sentences.
1 (a) (i) The atomic number of an atom is the number of .......................... show full transcript
Worked Solution & Example Answer:This question is about atomic structure and elements - AQA - GCSE Chemistry - Question 1 - 2015 - Paper 1
Step 1
1 (a) (i) The atomic number of an atom is the number of
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Answer
protons.
Step 2
1 (a) (ii) The mass number of an atom is the number of
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Answer
protons plus neutrons.
Step 3
1 (b) Explain why an atom has no overall charge.
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An atom has no overall charge because it contains protons and electrons that have equal but opposite electrical charges. Specifically, protons have a positive charge of +1, while electrons have a negative charge of -1. Since the number of protons in an atom equals the number of electrons, their charges cancel each other out, resulting in a neutral atom.
Step 4
1 (c) Explain why fluorine and chlorine are in the same group of the periodic table.
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Fluorine and chlorine are in the same group of the periodic table because they have similar electronic structures. Fluorine has an electronic structure of 2,7, while chlorine has an electronic structure of 2,8,7. Both elements have seven electrons in their highest energy level, which is why they exhibit similar chemical properties.
Step 5
1 (d) What is the chemical symbol of this non-metal?
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The chemical symbol of this non-metal is S (sulfur).
Step 6
1 (e) (i) Compounds formed when non-metals react with metals consist of particles called
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ions.
Step 7
1 (e) (ii) Compounds formed from only non-metals consist of particles called
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