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?
14
13
27
An atom has an atomic number of 9 and a mass number of 19. What are its numbers of protons, neutrons and electrons?
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
Four atoms have the numbers of protons and neutrons 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 best definition of the relative atomic mass of an element?
The number of protons in its atoms
The total number of protons and neutrons in its atoms
The average mass of its atoms compared to one-twelfth of the mass of a carbon-12 atom
What is the maximum number of electrons that the first electron shell can hold?
2
8
10
Fluorine is element number 9 in the periodic table and is in Group 7, Period 2. Which is the correct electron configuration for fluorine?
What is the electron configuration of aluminium (atomic number 13)?
3.8.2
2.3.8
2.8.3
Neon has two common isotopes. 90% of neon atoms are neon–20 and 10% of neon atoms are neon–22. What is the relative atomic mass of neon?
20
20.2
21.8