atomic structure Flashcards
1
Q
what is the plum pudding model of the atom?
A
an atom is a ball of positive charge with negative electrons embedded in it.
2
Q
which scientist found evidence for the existence of neutrons?
A
James Chadwick
3
Q
what are isotopes?
A
atoms of the same element with different numbers of neutrons.
4
Q
the typical radius of an atom?
A
1 x 10^-10
5
Q
An atom has 13 protons and 14 neutrons. What is its mass number?
A
The mass number is the total number of protons and neutrons: 13 + 14 = 27.
