7 Particles
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State the three subatomic particles
Protons, neutrons, electrons
State the masses of the subatomic particles
Protons: 1, neutrons: 1, electrons: 0
State the relative charges of the subatomic particles
Protons: +1, neutrons: 0, electrons: -1
How do you calculate the number of neutrons in an atom on the periodic table?
Mass number - atomic number
What is atomic number?
The number of protons in the atom (the smaller number on the bottom)
What is mass number?
The number of protons + number of neutrons
Why do atoms have no overall charge?
Because they have the same number of electrons as protons so the charges cancel each other out.
Sodium has a mass number of 23, and an atomic number of 11. How many electrons, protons and neutrons?
11 protons, 11 electrons, 12 neutrons
Aluminium has a mass number of 27, and an atomic number of 13. How many electrons, protons and neutrons?
13 protons, 13 electrons, 14 neutrons
How does the size of the nucleus compare to the size of the atom?
Nucleus is very very small compared to the size of the atom
What are the similarities and differences between isotopes?
Same number of protons but a different number of neutrons.