How many neutrons are in a nucleus of the nuclide?

• 17

• 20

• 37

• 54

A neutral atom consists of electrons orbiting a nucleus. The nucleus contains protons and neutrons.

Which statement about the atom 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.

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.

The figure 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

A proton and a neutron are each close to a positive nucleus.

How does the charge on the nucleus affect the proton and the neutron, if at all?

• The neutron is attracted; the proton is repelled.

• The neutron is not affected; the proton is repelled.

• The proton is attracted; the neutron is repelled.

• The proton is not affected; the neutron is repelled.

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.

A nucleus of element X is represented as shown. Which is an isotope of element X?

• 
• 
• 
• 

A particular nuclide has the symbol shown. What is true for atoms of this nuclide?

• There are 17 nucleons in the nucleus

• There are 17 protons in the nucleus

• There are 37 electrons in the nucleus

• There are 37 neutrons in the nucleus

A particular nuclide has the symbol shown. What is true for atoms of this nuclide?

• There are 14 nucleons in the nucleus

• There are 14 protons in the nucleus

• There are 14 electrons in the nucleus

• There are 14 neutrons in the nucleus

A nuclide has the shown symbol. What is the neutron number of a nucleus of this nuclide?

• 12

• 10

• 22

• 32