Atomic Number and Atomic Mass

Can the number of protons change in an atom?

• Yes, it can change without affecting the element.

• No, the number of protons in an atom defines the element and cannot change without changing the element itself.

• Yes, protons can be added or removed through chemical reactions.

• No, protons can change but only in certain isotopes.

What is the atomic number of an element?

• The number of neutrons in the nucleus of an atom.

• The number of protons in the nucleus of an atom.

• The total number of electrons in an atom.

• The mass number of an atom.

What is an isotope?

• A variant of an element with the same number of protons and neutrons.

• A variant of an element that has the same number of protons but a different number of neutrons.

• A type of atom that has more electrons than protons.

• An element that has lost all its neutrons.

What is the mass of one proton compared to one electron?

• The mass of one proton is less than the mass of one electron.

• The mass of one proton is equal to the mass of one electron.

• The mass of one proton is greater than the mass of one electron.

• The mass of one proton is negligible compared to the mass of one electron.

What determines the identity of an element?

• The number of neutrons in its nucleus.

• The number of protons in its nucleus.

• The number of electrons surrounding the nucleus.

• The atomic mass of the element.

What is the atomic mass of an element?

• The total number of protons in the nucleus of an atom.

• The weighted average mass of an element's isotopes, measured in atomic mass units (amu).

• The mass of an atom measured in grams.

• The mass of an atom's electrons compared to its protons.

What is the charge of a neutron?

• It has a positive charge.

• It has a negative charge.

• It has no charge (it is neutral).

• It has a variable charge depending on its environment.

How do you calculate the number of neutrons in an atom?

• By adding the atomic number and atomic mass.

• By subtracting the atomic number from the atomic mass.

• By multiplying the atomic number by the atomic mass.

• By dividing the atomic mass by the atomic number.

If an element has an atomic number of 6, how many protons does it have?

• 4 protons

• 6 protons

• 8 protons

• 10 protons

What is the charge of an electron?

• Positive charge

• Neutral charge

• Negative charge

• Variable charge