Sec 4.1: Intro to Atoms

A proton's mass is _____ amu, an electron is ____ amu, and a neutron has ____ amu.

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Atoms are

Building blocks of matter

atoms with the same number of protons and electrons but different number of neutrons

Isotopes

An electron's movement is related to its _________, or the specific amount of energy it has.

energy level

Compounds

molecules that contain more than one element and are set in a specific ratio

Electrons are

negatively charged and fall in orbital paths around the nucleus

Electrons have almost

no mass

The ______ of protons are the same as the ________ of electrons

number

The atomic number of an element

number of protons

The nucleus of an atom is

positively charged and has a high density

A neutron has

the same approximate mass as a proton, but no charge

Atoms with the same element have

the same mass

An atom is a

the smallest unit of matter that still retains the properties of an element