Mastering Atomic and Mass Numbers in Elements

The video tutorial explains the concepts of atomic and mass numbers as seen on the periodic table. It describes the atomic number as the count of protons in an atom, which is unique to each element, and the mass number as the sum of protons and neutrons. The tutorial provides examples with hydrogen, oxygen, and lithium to illustrate how to calculate the number of neutrons by subtracting the atomic number from the mass number.

What two numbers are found in each element's box on the periodic table?

• Mass number and electron number

• Atomic number and mass number

• Proton number and electron number

• Atomic number and electron number

What does the atomic number of an element represent?

• The total mass of an atom

• The number of neutrons in an atom

• The number of protons in an atom

• The number of electrons in an atom

Which element has an atomic number of 8?

• Oxygen

• Carbon

• Lithium

• Hydrogen

What does the mass number of an element indicate?

• The total number of protons and neutrons in an atom

• The number of neutrons in an atom

• The number of protons in an atom

• The total number of electrons in an atom

Why are electrons not considered in the mass number of an atom?

• They are too small to significantly affect the mass

• They have a negative charge

• They are not part of the nucleus

• They are equal in number to protons

How many neutrons are in an oxygen atom with a mass number of 16?

• 12

• 10

• 8

• 6

What is the formula to calculate the number of neutrons in an atom?

• Mass number plus atomic number

• Atomic number plus mass number

• Atomic number minus mass number

• Mass number minus atomic number

If lithium has a mass number of 7 and 3 protons, how many neutrons does it have?

• 2

• 3

• 4

• 5

What is the atomic number of lithium?

• 2

• 3

• 4

• 1

Which statement is true about the atomic and mass numbers?

• Mass number is the number of protons only

• Mass number is the number of electrons

• Atomic number is the sum of protons and neutrons

• Atomic number is the number of protons