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
The mass number is the sum of protons and neutrons in the nucleus of an atom.
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 equal numbers of protons and electrons. Protons have a positive charge (+1), while electrons have a negative charge (-1). The positive and negative 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 (F) has an electronic structure of 2,7, and chlorine (Cl) has an electronic structure of 2,8,7. They belong to the same group because they have the same number of electrons in their outer shell, specifically 7 electrons. This similarity in electronic structure accounts for their similar chemical properties.
Step 5
1 (d) What is the chemical symbol of this non-metal?
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The chemical symbol of the non-metal shown in the diagram 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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