atoms and elements Flashcards
1
Q
radius of an atom
A
0.1 nanometres (1 x 10⁻¹⁰m)
2
Q
radius of a nucleus
A
1 x 10⁻¹⁴m (around 1/10000 radius of an atom)
3
Q
list the sub-atomic particles
A
protons, neutrons, electrons
4
Q
mass and charge of proton
A
1, +1
5
Q
mass and charge of neutron
A
1, 0
6
Q
mass and charge of electron
A
1/1840, -1
7
Q
charge of an atom
A
0, neutral
8
Q
why do atoms have a neutral charge
A
they have the same number of protons and electrons so the charges cancel out
9
Q
atomic number
A
number of protons
10
Q
mass number
A
total number of protons and neutrons
11
Q
how to work out number of neutrons
A
mass number-atomic number
12
Q
elements
A
substance consisting of the same atoms
13
Q
which number determines the type of atom
A
proton number
