The video tutorial explains atomic radius, a measure of an atom's size, and how it is determined as half the distance between the nuclei of two bonded atoms. It discusses the difference between bonding atomic radius and non-bonding (Vander Waals) radius. The video also explores trends in atomic radius across the periodic table, noting that atomic size decreases from left to right due to increased nuclear charge, and increases from top to bottom as additional energy levels are added.

What is the atomic radius?

• The distance between two electrons in an atom

• 1/2 the distance between the nuclei of two bonded atoms

• The size of the nucleus

• The distance between the nucleus and the outermost electron

What is the traditional view of the atom?

• Nucleus in the center with electrons in fixed orbits

• Nucleus in the center with electrons in clouds of probability

• Electrons in the center with nucleus orbiting

• Nucleus and electrons both in fixed positions

What is the bonding atomic radius?

• 1/2 the distance between the nuclei of two bonded atoms

• The distance between the nucleus and the outermost electron

• The size of the nucleus

• 1/2 the distance between two electrons in an atom

Why is it difficult to measure the atomic radius directly?

• Because the nucleus is not visible

• Because electrons are constantly moving

• Because the nucleus is too small

• Because atoms are too far apart

What happens to the atomic radius as you move from left to right across a period?

• It remains the same

• It decreases

• It increases

• It fluctuates

Why does the atomic radius decrease across a period?

• Because the atoms lose protons

• Because the number of electrons decreases

• Because the nuclear charge increases, pulling electrons closer

• Because the number of energy levels decreases

Which element has a larger atomic radius, lithium or neon?

• Cannot be determined

• Both have the same atomic radius

• Neon

• Lithium

What happens to the atomic radius as you move down a group?

• It fluctuates

• It increases

• It remains the same

• It decreases

Why does the atomic radius increase down a group?

• Because the atoms lose protons

• Because the number of electrons decreases

• Because the number of energy levels increases

• Because the nuclear charge decreases

Which element has more energy levels, lithium or sodium?

• Lithium

• Cannot be determined

• Sodium

• Both have the same number of energy levels