1: Discuss the difference between the radii of vanadium (171pm) and chromium (166pm)

2: Why the radius of a potassium atom is better than that of a sodium atom?

1:What is electronegativity, and how does it affect the way atoms share electrons in a covalent bond?

2:Why do carbon and hydrogen form a nonpolar covalent bond in methane (CH₄)?

3:How does the difference in electronegativity between oxygen and hydrogen affect the bonding in a water molecule (H₂O)?

4:What is the main difference between a polar covalent bond and a nonpolar covalent bond?

5:In a water molecule, why does the oxygen atom have a slightly negative charge while the hydrogen atoms have a slightly positive charge?