Understanding Atomic Structure and Isotopes

The video tutorial explains how to determine the number of neutrons in an atom by using the atomic number and mass number. It covers the concept of atomic weight and rounding rules, and provides examples of calculating neutrons for various elements. The tutorial also introduces isotopes, explaining how they are atoms of the same element with different mass numbers due to varying numbers of neutrons.

What is the sum of protons and neutrons in an atom called?

• Atomic number

• Mass number

• Atomic weight

• Isotope number

If an element has an atomic number of 6 and a mass number of 12, how many neutrons does it have?

• 18

• 0

• 12

• 6

How do you determine the atomic number of an element?

• By measuring atomic weight

• By counting the neutrons

• By counting the protons

• By adding protons and neutrons

Which of the following elements is an example of a special case due to its atomic weight?

• Carbon

• Uranium

• Chlorine

• Copper

What is the mass number of an element with 29 protons and 34 neutrons?

• 58

• 29

• 34

• 63

For an element with a mass number of 238 and 92 protons, how many neutrons does it have?

• 146

• 54

• 92

• 238

What defines isotopes of an element?

• Same atomic number, different mass numbers

• Different atomic numbers, same mass number

• Different atomic weights, same protons

• Same number of neutrons, different protons

If two elements have the same atomic number but different mass numbers, what are they called?

• Isotopes

• Compounds

• Ions

• Molecules

What is the neutron count for an element with a mass number of 235 and 92 protons?

• 235

• 327

• 92

• 143

Which of the following is true about isotopes?

• They have the same number of neutrons.

• They are different elements.

• They have different mass numbers.

• They have different atomic numbers.