GCSE Chemistry AQA: topic 1- Atomic Structure and the periodic Table.
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GCSE Chemistry AQA: topic 1- Atomic Structure and
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GCSE Chemistry AQA: Topic 1- Atomic Structure And
GCSE Chemistry AQA: topic 1- Atomic Structure and the periodic Table.
1. What is the fundamental unit of an element?
Answer: Atoms are the smallest units of an element that can exist, and all substances are composed of
atoms.
2. How many elements are listed on the periodic table?
Answer: ...
GCSE Chemistry AQA: topic 1- Atomic Structure and the periodic Table.
1. What is the fundamental unit of an element?
Answer: Atoms are the smallest units of an element that can exist, and all substances are composed of
atoms.
2. How many elements are listed on the periodic table?
Answer: The periodic table lists 118 known elements.
3. What is the definition of a compound?
Answer: A compound is a substance formed by chemically combining two or more different elements.
4. What is a mixture, and how does it differ from a compound?
Answer: A mixture is a substance containing two or more different elements that are not chemically
bonded together, whereas a compound is formed by chemical bonding.
5. What is a solute and a solvent, and how do they interact?
Answer: A solute is a substance dissolved in a solvent, which is the substance that does the dissolving.
6. What is a solution, and how is it different from a mixture?
Answer: A solution is a homogeneous mixture of two or more substances, whereas a mixture can be
heterogeneous.
7. Sketch an atom and label its nucleus and electrons.
, Answer: [Insert sketch]
8. What is the charge of a proton, and how does it relate to the charge of an atom?
Answer: Protons have a charge of +1, and atoms have a neutral charge because they have an equal
number of protons and electrons.
9. How do you calculate the number of protons and electrons in an atom?
Answer: The atomic number (bottom number) represents the number of protons and electrons in an
atom.
10. **Quick Fact #1**: In what situation does the number of electrons equal the number of protons in
an atom?
Answer: This is true for neutral atoms, but not for ions.
11. How do you determine the number of neutrons in an atom?
Answer: You calculate the mass number minus the atomic number to find the number of neutrons.
12. What does the mass number represent in an atom?
Answer: The mass number represents the total number of protons and neutrons in an atom.
13. What is an isotope, and how does it differ from other atoms of the same element?
Answer: An isotope is an atom of the same element that has a different number of neutrons.
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