atomic structure Flashcards
1
Q
what is the proton relative charge
A
+1
2
Q
what is the neutron relative charge
A
0
3
Q
what is the electron relative charge
A
-1
4
Q
what is the proton relative mass
A
1
5
Q
what is the neutron relative mass
A
1
6
Q
what is the electron relative mass
A
1/1840
7
Q
why is an atom said to be ‘electrically neutral’
A
as it contains an equal no. of protons and electrons
8
Q
what is the mass number
A
total no. of protons and neutron
9
Q
define isotopes
A
are atoms of the same element with the same no. of proton and electron but different number of neutron
10
Q
what is a valance shell
A
the one furthest away from the chemical symbol
11
Q
what is valance electrons
A
electrons in the outermost shell
