6 Protons Neutrons And Electrons
Atomic construction - (CCEA)
Scientists' ideas about atoms take changed over time. Today, they concord that atoms have a positively-charged nucleus fabricated of protons and neutrons, and negatively-charged electrons that orbit the nucleus in shells.
Protons, neutrons and electrons
The relative mass , relative accuse and location in the atom for each subatomic particle is given in the table.
| Subatomic particle | Relative mass | Relative charge | Location in atom |
|---|---|---|---|
| Proton | i | +1 | In nucleus |
| Neutron | one | 0 | In nucleus |
| Electron | \[\frac{1}{1840}\] | -one | In shells around nucleus |
Atomic number
An atom's atomic number is the number of protons in its nucleus.
Atomic number = number of protons
Mass number
An atom'south mass number is the total number of protons and neutrons .
Mass number = number of protons + number of neutrons
Electrical charge
An cantlet has no overall charge, considering it has an equal number of protons and electrons.
When we write the symbol for an cantlet, we can place its mass number at the acme left and its diminutive number at the bottom left .
You tin can use these numbers to summate the number of protons, neutrons and electrons in an atom.
Number of protons = number of electrons = diminutive number
Number of neutrons = mass number – atomic number
- Question
-
The atomic number of a sodium atom is 11 and its mass number is 23. Calculate the number of protons, neutrons and electrons it contains.
-
Number of protons = eleven
Number of electrons = eleven
Number of neutrons (mass number - diminutive number) = 23 - 11 = 12
6 Protons Neutrons And Electrons,
Source: https://www.bbc.co.uk/bitesize/guides/z6k2gwx/revision/2
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