WorksheetsAtomic Structure and Atomic Mass
Total questions: 10
Worksheet time: 5mins
Which of the following is not a particle of atom?
Proton
Electron
Positron
Neutron
The nucleus of an atom has
Proton and electron
Proton and neutron
Electron and neutron
Proton only
Atomic number is the number of
Protons
Electrons
Neutrons
Mass number is the total number of
Protons, electrons and neutrons
Protons and electrons
Protons and neutrons
Electrons and neutrons
The mass number of an element is 31 and the atomic number is 15. How many electrons does it have?
14
15
16
31
The mass number of an element is 31 and the atomic number is 15. How many neutrons does it have?
15
14
16
31
An element has 19 electrons and 20 neutrons. What is its atomic number?
39
19
20
1
Isotopes have same atomic number but different
number of protons
number of electrons
number of neutrons
Spontaneous emission of radiation when an isotope becomes unstable is called
Radioactivity
Diffusion
Reflection
Magnetism
Relative abundance of an isotope is the percentage of that isotope in the naturally occurring environment
True
False
