Atoms that have the same number of valence electrons in their outer shell
a.
must be atoms of the same element.
b.
belong to the same family of elements.
c.
are all metallic elements.
d.
are all nonmetallic elements.

State the formula for density in words and mathematical symbols

Suppose you have designed a new thermometer called the x thermometer. on the x scale the boiling point of water is 129 ? x and the freezing point of water is 13 ? x. part a at what temperature are the readings on the fahrenheit and x thermometers the same?

What happens to the temperature of a substance when the average kinetic energy of its particles increases?