Atomic Structure and Isotopes

The video tutorial explains the differences between neutral atoms, ions, and isotopes. It begins by describing the structure of an atom, including the nucleus and energy levels. The tutorial then discusses how neutral atoms have equal numbers of protons and electrons, and how ions are formed by adding or removing electrons. It further explains the concepts of cations and anions, and introduces isotopes as atoms with the same number of protons but different numbers of neutrons. The video concludes by differentiating between atomic mass and mass number, using examples from the periodic table.

What is the central part of an atom called?

• Proton

• Nucleus

• Electron

• Neutron

In a neutral atom, what is the relationship between protons and electrons?

• No protons

• More protons than electrons

• More electrons than protons

• Equal number of protons and electrons

What happens to an atom when it loses electrons?

• It becomes a positive ion

• It becomes a neutral atom

• It remains unchanged

• It becomes a negative ion

What is a cation?

• A negatively charged atom

• A positively charged atom

• An atom with no charge

• An atom with equal protons and electrons

What defines isotopes of an element?

• Same number of electrons

• Different atomic numbers

• Same number of neutrons

• Same number of protons

Which of the following is an isotope of carbon?

• Carbon 15

• Carbon 18

• Carbon 12

• Carbon 10

What is the mass number of an atom?

• Sum of protons and electrons

• Sum of neutrons and electrons

• Sum of protons and neutrons

• Sum of all particles

What does the atomic mass on the periodic table represent?

• Exact mass of an atom

• Mass of the lightest isotope

• Average mass of isotopes

• Mass of the heaviest isotope

Why do some elements have decimal values for atomic mass?

• Due to isotopes

• Due to electron mass

• Due to neutron mass

• Due to proton mass

What should you do to learn more about mass number and atomic mass?

• Ask a teacher

• Read a book

• Ignore it

• Check the video link