Complete the sentences - AQA - GCSE Chemistry - Question 1 - 2015 - Paper 1
Question 1
Complete the sentences.
1 (a) (i) The atomic number of an atom is the number of ....................................................... .
1 (a) (ii) The mass numb... show full transcript
Worked Solution & Example Answer:Complete the sentences - 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
the number of protons in the nucleus of the atom.
Step 2
1 (a) (ii) The mass number of an atom is the number of
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Answer
the mass number of an atom is the sum of the protons and neutrons present in the nucleus.
Step 3
1 (b) Explain why an atom has no overall charge.
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An atom has no overall charge because the number of protons (which have a positive charge) is equal to the number of electrons (which have a negative charge). The positive and negative charges cancel each other out, resulting in a net charge of zero.
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, while chlorine (Cl) has an electronic structure of 2, 8, 7. Both elements are in the same group because they have the same number of outer electrons (7 in both cases), which gives them similar chemical properties.
Step 5
1 (d) What is the chemical symbol of this non-metal?
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The chemical symbol for 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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