CAIE IGCSE Chemistry 2.2.3 Proton Number Atomic Number As the Questions

Use proton number to identify an element in CAIE IGCSE Chemistry, defining atomic number from nuclear protons and distinguishing it from the nucleon total.

Exam points

Define atomic or proton number as the number of protons in the nucleus, rather than protons plus neutrons.
Read a particle table or stated proton count to give the atomic number or identify the element.
Explain that particles are the same element because their proton numbers match, even when electron or neutron counts differ.

[Maximum number: 1]

The structure of an atom of element X is shown.

Figure for Question CAIE IGCSE Chemistry 2.2.3 Proton Number Atomic Number As the Questions question 1 — CAIE IGCSE Chemistry

key
- = electron
n= neutron
p= proton

What is element X ?

boron

carbon

sodium

sulfur

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CAIE IGCSE Chemistry 2.2.3 Proton Number Atomic Number As the Questions question 1