Which statement describes the location of protons and neutrons in an atom of helium?*

Given a list of atomic model descriptions:

A: electron shells outside a central nucleus B: hard, indivisible sphere C: mostly empty space

Which list of atomic model descriptions represents the order of historical development from the earliest to most recent?*

Which list represents the classification of the elements nitrogen, neon, magnesium, and silicon, respectively?*

In the ground state, all atoms of Group 15 elements have the same number of*

What is the chemical formula for ammonium sulfide?*

Which formula is an empirical formula?*

Chemical properties can be used to*

Ice, H₂O(s), is classified as*

Which phrase describes the molecular polarity and distribution of charge in a molecule of carbon dioxide, CO₂?*

Which element tends not to react with other elements?*

Given the equation representing a reaction:

O + O → O₂

Which statement describes the changes that occur as the oxygen molecule is produced?*

Which term represents the strength of the attraction an atom has for the electrons in a chemical bond?*

Compared to a 15-gram sample of Cu(s) at 25°C, a 25-gram sample of Cu(s) at 25°C has*

Which substance can not be broken down by a chemical change?*

The kinetic molecular theory states that all particles of an ideal gas are*