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- 1. Multiple Choice
How many neutrons are in a nucleus of the nuclide?
17
20
37
54
- 2. Multiple Choice
A certain element has several isotopes. Which statement about these isotopes is correct?
They must have different numbers of electrons orbiting their nuclei.
They must have the same number of neutrons in their nuclei.
They must have the same number of nucleons in their nuclei.
They must have the same number of protons in their nuclei.
- 3. Multiple Choice
A neutral atom consists of electrons orbiting a nucleus. The nucleus contains protons and neutrons. Which statement about the atoms must be correct?
The number of electrons is equal to the number of neutrons.
The number of electrons is equal to the number of protons.
The number of neutrons is equal to the number of protons.
The number of electrons, neutrons and protons are all different.
- 4. Multiple Choice
The picture shows the symbols for five different nuclides. Which two nuclides are isotopes of the same element?
nuclide 1 and nuclide 2
nuclide 2 and nuclide 3
nuclide 2 and nuclide 5
nuclide 4 and nuclide 5
- 5. Multiple Choice
Below are four statements about isotopes of a certain element. Which statement about the isotopes must be correct?
They are radioactive
They are unstable
They have the same number of neutrons
They have the same number of protons
- 6. Multiple Choice
Which statement is correct for the nucleus of any atoms?
The nucleus contains electrons, neutrons and protons.
The nucleus contains the same number of protons as neutrons.
The nucleus has a total charge of zero.
The nucleus is very small compared with the size of the atom.
- 7. Multiple Choice
Which particles are emitted during thermionic emission?
atoms
electrons
neutrons
proton
- 8. Multiple Choice
A particular nuclide of chlorine can be represented by the symbol shown in picture. How many electrons are there in a neutral atom of this nuclide?
17
20
37
54
- 9. Multiple Choice
The diagram represents a carbon atom. What is the nucleon number (mass number) for this atom?
6
8
14
20
- 10. Multiple Choice
Helium has a mass number of 3 and atomic number of 2. Which diagram represents an atom of helium?
- 11. Multiple Choice
A very important experiment increased scientists' understanding of the structure of matter. In the experiment, particles scattered as they passed through a thin metal foil. Which particles were used?
alpha particles
beta particles
gamma rays
x-rays
- 12. Multiple Choice
The scattering of alpha particles by a thin metal foil increased scientist's understanding of the structure of matter. Which conclusion did the experiment lead?
matter is made up of atoms
atoms have a very small nucleus
atom is composed of electrons surrounded by a cloud of positively charge
atoms has a small, dense , negatively charged nucleus at the center
- 13. Fill in the Blank
Mass number is also known as (BLANK) number
- 14. Fill in the Blank
Proton number is also known as (BLANK) number.
- 15. Fill in the Blank
Isotopes are atoms of the same (BLANK) that have equal numbers of protons but different numbers of neutrons.
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