GCSE Chemistry - Elements, Isotopes & Relative Atomic Mass #2

The video tutorial explains atomic structure, focusing on protons, neutrons, and electrons. It discusses how elements are organized in the periodic table by atomic number, which is determined by the number of protons. The concept of isotopes is introduced, highlighting that they are variations of elements with different neutron counts but the same number of protons. The tutorial also covers how to calculate the relative atomic mass of an element using the abundance and mass of its isotopes, using copper as an example.

What is the smallest element based on the number of protons?

• Hydrogen

• Helium

• Carbon

• Lithium

What does the atomic number of an element represent?

• Number of isotopes

• Number of protons

• Number of electrons

• Number of neutrons

Which element has an atomic number of 3?

• Helium

• Carbon

• Lithium

• Sodium

What are isotopes?

• Atoms with the same number of protons and neutrons

• Atoms with the same number of protons but different numbers of neutrons

• Atoms with different numbers of protons and electrons

• Atoms with the same number of neutrons but different numbers of protons

Which isotope of carbon has 7 neutrons?

• Carbon-11

• Carbon-14

• Carbon-13

• Carbon-12

What is the relative atomic mass of copper to one decimal place?

• 63.5

• 65.0

• 63.6

• 64.0

How do you calculate the relative atomic mass of an element?

• Sum of isotope masses divided by the number of isotopes

• Sum of isotope abundances times isotope masses divided by the sum of the abundances

• Sum of isotope masses times isotope abundances divided by the number of isotopes

• Sum of isotope abundances divided by the number of isotopes