Atomic Radius and Nuclear Charge Concepts

The video tutorial discusses the atomic radii of elements in the second period of the periodic table. It explains how to arrange these elements in decreasing order of their atomic radii and confirms their arrangement according to the periodic table. The tutorial identifies lithium as having the largest atomic radius and oxygen as the smallest. It further explains the trend of decreasing atomic radius from left to right across a period due to increasing nuclear charge, which pulls electrons closer to the nucleus, reducing atomic size.

Which elements are discussed in the context of their atomic radii in Activity 5.7?

• Boron, Beryllium, Oxygen, Nitrogen, Lithium, Carbon

• Hydrogen, Helium, Neon

• Sodium, Magnesium, Aluminum

• Chlorine, Argon, Potassium

What is the correct decreasing order of atomic radii for the given elements?

• Nitrogen, Oxygen, Lithium, Beryllium, Boron, Carbon

• Oxygen, Nitrogen, Carbon, Boron, Beryllium, Lithium

• Lithium, Beryllium, Boron, Carbon, Nitrogen, Oxygen

• Boron, Carbon, Nitrogen, Oxygen, Lithium, Beryllium

Which element has the largest atomic radius among the given elements?

• Carbon

• Lithium

• Boron

• Oxygen

Which element has the smallest atomic radius among the given elements?

• Nitrogen

• Oxygen

• Beryllium

• Lithium

How does the atomic radius change as we move from left to right across a period?

• It increases

• It first increases then decreases

• It decreases

• It remains constant

What is the main reason for the decrease in atomic radius across a period?

• Decrease in electron shells

• Increase in nuclear charge

• Increase in electron shells

• Decrease in nuclear charge

What effect does an increase in nuclear charge have on electrons?

• Pushes electrons away from the nucleus

• Pulls electrons closer to the nucleus

• Has no effect on electron position

• Increases the number of electron shells

In the context of atomic radius, what happens to the size of the atom as the nuclear charge increases?

• The atomic size increases

• The atomic size decreases

• The atomic size remains the same

• The atomic size fluctuates