Atomic Structure and Isotopes

The video tutorial explains isotopes, focusing on carbon-14 and its transformation into nitrogen-14. It covers atomic symbols, how to calculate protons and neutrons, and provides examples for practice. The tutorial concludes with a summary and homework instructions.

What happens to an element when a neutron is changed into a proton?

• It becomes a different isotope of the same element.

• It becomes a different element.

• It remains the same element.

• It loses its atomic mass.

Which of the following is an example of isotopes?

• Silicon-28 and Silicon-32

• Nitrogen-14 and Oxygen-16

• Carbon-12 and Carbon-14

• Hydrogen-1 and Helium-4

What does the mass number of an element represent?

• The total number of protons and neutrons

• The number of electrons

• The number of neutrons only

• The number of protons only

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

• Subtract the atomic number from the mass number

• Divide the mass number by the atomic number

• Multiply the atomic number by the mass number

• Add the atomic number to the mass number

What is the atomic symbol for an element with 25 protons?

• Fe

• Cu

• Mg

• Mn

If an element has 15 protons and 17 neutrons, what is its mass number?

• 28

• 32

• 17

• 15

Which element is defined by having 92 protons?

• Radium

• Plutonium

• Thorium

• Uranium

What defines the identity of an element?

• The atomic mass

• The number of protons

• The number of neutrons

• The number of electrons

How do isotopes of the same element differ?

• In the number of protons

• In the number of electrons

• In the atomic number

• In the number of neutrons

What is the significance of the atomic number?

• It represents the total mass of the atom.

• It shows the number of electrons.

• It defines the element by the number of protons.

• It indicates the number of neutrons.