Relative electrical charges of subatomic particles Flashcards – AQA GCSE Combined Science: Trilogy (8464) — Chemistry — Higher

What are nucleons?

The protons and neutrons in an atomic nucleus.

What are the relative charges of a proton, a neutron and an electron?

Proton: $+1$; neutron: $0$; electron: $-1$.

Where are electrons located relative to the atomic nucleus?

Outside the nucleus.

What is the proton number, or atomic number, $Z$?

The number of protons in the nucleus.

What does the proton number identify?

The element.

What is the nucleon number, or mass number, $A$?

The total number of protons and neutrons in the nucleus.

How is the number of neutrons calculated from the nucleon number $A$ and proton number $Z$?

$A-Z$

In nuclide notation ${}^{A}_{Z}\mathrm{X}$, what do $A$, $Z$ and $\mathrm{X}$ represent?

$A$: nucleon number; $Z$: proton number; $\mathrm{X}$: element symbol.