Atomic Structure and Charge Concepts

The video tutorial explains the basic structure of an atom, focusing on protons, neutrons, and electrons. It covers the concept of chemical symbols, atomic numbers, and mass numbers, using potassium as an example. The tutorial differentiates between atomic mass and mass number and introduces the concept of ions, explaining how to calculate the number of protons, neutrons, and electrons in ions with different charges. It provides examples with phosphorus and iron, demonstrating how to determine if an element is neutral or an ion. The video concludes with practice problems and encourages viewers to seek help with homework questions.

Which of the following particles in an atom is positively charged?

• Proton

• Electron

• Photon

• Neutron

In a chemical symbol, what does the letter 'Z' represent?

• Atomic number

• Isotope number

• Mass number

• Charge

How do you calculate the number of neutrons in an atom?

• Add protons and electrons

• Subtract electrons from protons

• Add atomic number and mass number

• Subtract atomic number from mass number

What is the charge of an ion if it has more electrons than protons?

• Neutral

• Negative

• Positive

• Zero

If phosphorus has a negative 3 charge, how many electrons does it have?

• 18

• 12

• 15

• 21

What happens to the electron count when an ion has a positive charge?

• It remains the same

• It decreases

• It increases

• It doubles

If an element has equal numbers of protons and electrons, what is its charge?

• Variable

• Neutral

• Negative

• Positive

An element with 26 protons and 29 electrons has what charge?

• +3

• -3

• +1

• 0

What is the atomic number of iron?

• 24

• 25

• 26

• 27

How do you determine the mass number of an element?

• Subtract electrons from protons

• Add protons and neutrons

• Add protons and electrons

• Subtract neutrons from electrons