Earth's air consists of the following gases in the order of how abundant they are.

78% of Earth's air consists of __

Identify the state of matter: atoms packed closely together, vibrating, fixed shape, fixed volume

Identify the state of matter: Atoms spaced far apart, atoms move freely, no fixed shape, no fixed volume

____ is how closely packed the atoms are in a gas, liquid, or solid

The amount of matter that anything is made up of is called its ____

The amount of space a gas, liquid or solid takes up is called its ___

Which has greater mass, the helium balloon or the air that surrounds the balloon because helium atoms have a very small mass of 4a mu.

The atomic number of an element is the same as the number of ____ in the nucleus.

Mass = ______ + _______

In air, some gases travel in pairs. Select those that do this:

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