In general, electron affinity decreases when moving down a group. This is due to

A decrease in atomic size

B. increase in number of electrons

C. increase in nuclear charge

D. increase in atomic size

What is the mass of aluminum that would have the same number of atoms as 1.35 grams of cadium

All samples of an element are composed of atoms with the same1. atomic mass2. atomic number3. # of nucleons4. # of neutrons

What is the nature of the SE-CI bond in molecule of selenium chloride (SeCI3) if the electronegativity value of selenium is 2.55 and that of chlorine is 3.16? Non polar covalent Moderately polar covalent Highly polar covalent Ionic Polar ionic

What does the Pauli exclusion principle state? A) Electrons will be added to an atom at the lowest possible level or sublevel. B) An orbital can contain two electrons only if all other orbitals at that sublevel are empty.

How do you express relative amounts of each element in a compound?

Which of these sequences lists units of astronomical measurement from smallest to largest? A. light-year - -> AU - -> kilometer - -> mile B. light-year - -> AU - -> mile - -> kilometer C. kilometer - -> mile - -> AU - -> light-year D.

Open-ended question: Differentiate between a solution and a two phase mixture. Brass is would be classified as which one of them? Which would you classify a salad as?

29.00gx11.000g equals to what? And then round to appropriate significant number.

Compounds keep the chemical properties of the elements they are made from.

Which of the following is the best name for a compound made from nitrogen and oxygen? (N2O3) nitrogen oxide nitrogen II oxide nitrogen trioxide dinitrogen trioxide