Atomic Structure and Isotopes

The video tutorial explains how to interpret the periodic table, focusing on atomic numbers, element symbols, and atomic mass. It discusses isotopes, their impact on atomic mass, and the concept of average atomic mass. The tutorial also covers how to count protons, electrons, and neutrons in an atom, using examples of isotopes like nickel-59, lithium-7, and sulfur-33.

What does the atomic number of an element represent?

• The number of neutrons in the nucleus

• The number of protons in the nucleus

• The total number of electrons

• The average atomic mass

Why are atomic masses on the periodic table not whole numbers?

• Because of the presence of isotopes

• Due to measurement errors

• Because protons and neutrons have variable masses

• Due to electron mass

What is an isotope?

• An atom with a different atomic number

• An atom with a different number of electrons

• An atom with a different number of protons

• An atom with a different number of neutrons

How is the average atomic mass of an element calculated?

• By adding the masses of all isotopes

• By taking the mass of the most common isotope

• By calculating the weighted average of all isotopes

• By averaging the number of protons and neutrons

What does the mass number of an atom represent?

• The total number of protons and electrons

• The total number of protons and neutrons

• The total number of neutrons and electrons

• The average atomic mass

If an atom is electrically neutral, what can be said about its protons and electrons?

• It has more electrons than protons

• It has more protons than electrons

• It has an equal number of protons and electrons

• It has no protons

In hyphen notation, what does the number after the element name represent?

• The atomic number

• The average atomic mass

• The mass number

• The number of electrons

How many neutrons are in lithium-7?

• 3

• 5

• 6

• 4

What is the atomic number of sulfur?

• 14

• 15

• 17

• 16

How many neutrons are in sulfur-33?

• 15

• 18

• 16

• 17