Which statement describes an aluminum (Al) atom? A) a negatively charged nucleus, surrounded by negatively charged electrons

B) a negatively charged nucleus, surrounded by positively charged electrons

C) a positively charged nucleus, surrounded by negatively charged electrons

D) a positively charged nucleus, surrounded by positively charged electrons

The phrase which describe an atom is "a positively charged nucleus surrounded by negatively charged electrons". Therefore, the answer is C.

Explanation: Atom is a smallest indivisible particle which is made up of many sub particles. The main sub particles are Protons, Neutrons and Electrons. Protons are positively charged, neutrons doesn't carry any charge hence neutral and electrons are negatively charged. Protons and neutrons are present in nucleus, therefore making the nucleus positively charged, while, electrons revolve around the nucleus in orbit hence being negatively charged particles surrounds the positively charged nucleus.

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.