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  • Topic 1. Edexcel Chemistry
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Topic 1. Edexcel Chemistry A level questions and answers 2024

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Topic 1. Edexcel Chemistry A level questions and answers 2024

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Topic 1. Edexcel Chemistry A level questions
and answers 2024
What is the relative mass of protons, neutrons and electrons? - Protons: 1

Neutrons: 1

Electrons: 1/1840



What is the relative charge of protons, neutrons and electrons? - Protons: +1

Neutrons: 0

Electrons: -1



What is atomic number? - -The number of protons in the nucleus of an atom of an
element.

-All atoms of the same element have the same number of protons.



What is the mass number? - The total number of protons and neutrons in the
nucleus of an atom of an element.



What is an isotope? - - Atoms of an element with the same number of protons but
a different number of neutrons.

- Same proton number but different mass number.

, Topic 1. Edexcel Chemistry A level questions
and answers 2024
What affects the physical properties of an isotope? - -Mass of atom affects
physical properties, so isotopes will have slightly different physical properties e.g.
different densities, rates of diffusion.



What affects the chemical properties of an isotope? - -Number and arrangement
of electrons determine the chemical properties, so isotopes have the same
chemical properties.



What is the relative atomic mass? - - Ar, is the AVERAGE mass of an atom of an
element relative to 1/12th of the mass of an atom of carbon-12.

- not usually a whole number.



What is the relative isotopic mass? - - The mass of an atom of an isotope,
compared to 1/12th of the mass of an atom of carbon-12.

- usually a whole number.



What is the relative molecular mass? - - Average mass of a molecule compared to
1/12th of the mass of an atom of carbon-12.

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