Page 128 - Science Course 2 (Book 1)

Mo5-L1a: Where Do Electrons Have the Most Energy?

Except for hydrogen, elements on the left side of the Protons and neutrons are in an atom’s nucleus.
table are metals. Electrons move around the nucleus.

Nonmetals are on the right side of the table.

Metalloids form the narrow stair-step region Electron
between metals and nonmetals. Neutron

Proton
Atoms Bond
A chemical bond is a force that holds two or
more atoms together in a compound. Nucleus

The electrons experience Electron
a force of attractions Cloud The atomic number of an element is the number of
from both nuclei. This (Negative) protons in each atom of that element.
negative–positive– + = +
negative attraction
holds the two particle
together.
This attraction is called a chemical bond one pair
of electrons constitutes one bond

An electron moves around the nucleus at a distance
that corresponds to its amount of energy.

Areas of space in which electrons move around the
nucleus are called energy levels.

Atoms contain protons, neutrons, and electrons. –
–

Proton First Energy
Level – + –
Neutron + +

Electron + + +
Second Energy
Level –
– carbon

Each proton has a positive charge; each neutron has Electrons closest to the nucleus have the least
no charge; and each electron has a negative charge. amount of energy. Electrons farthest from the
Proton nucleus have the greatest amount of energy

Electron

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