Atoms consist of a nucleus containing protons and neutrons, surrounded by electrons in shells. The numbers of subatomic particles in an atom can be calculated from its atomic number and mass number.
What does the plum pudding model of the atom show?
An atom as a ball of positive charge with negative electrons embedded in it
An atom as a ball of negative charge with positive electrons embedded in it
An atom as a ball of positive charge with negative neutrons embedded in it
What part of an atom was discovered as a result of an experiment where alpha particles were scattered by gold foil?
What is the radius of a typical atom?
1 × 10-6 m
1 × 10-10 m
1 × 10-14 m
What is the relative mass and charge of a neutron?
Mass = 1 and charge = -1
Mass = 0 and charge = +1
Mass = 1 and charge = 0
An atom has 13 protons and 14 neutrons. What is its mass number?
An atom has an atomic number of 9 and a mass number of 19. How many protons, neutrons and electrons does it have?
Protons = 10, neutrons = 19, electrons = 10
Protons = 9, neutrons = 10, electrons = 9
Protons = 19, neutrons = 10, electrons = 19
What are isotopes?
Atoms of the same element with different numbers of neutrons
Atoms of the same element with different numbers of protons
Atoms of the same element with different numbers of electrons
The numbers of protons and neutrons in four atoms is given below. Which two atoms are isotopes of the same element?
W: 8 protons and 8 neutrons
X: 8 protons and 10 neutrons
Y: 10 protons and 8 neutrons
Z: 9 protons and 10 neutrons
X and Y
W and X
X and Z
What is the electron configuration of a chlorine atom (atomic number 17)?
An element has the electron configuration 2,8,5. What period is it in?