Structure of the Atom

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What is the mass of a electron?

0.005 atomic mass units or 1/2000 a.m.u.

What is the mass of a neutron?

1 atomic mass unit

What is the mass of a proton?

1 atomic mass unit

How many electrons can fit in the first energy level?

2 electrons

Periodic Table of the Elements

A chart that shows 118 different types of atoms. 92 of the elements are naturally occurring.

electron

A negatively charged subatomic particle located outside of the nucleus. Mass is 0.005 a.m.u. or 1/2000 a.m.u.

neutron

A subatomic particle located in the nucleus that has no charge. Mass is 1 a.m.u.

Energy Levels

Areas around the outside of the nucleus where electrons are located. There are up to 7 rings.

How would you calculate the neutrons in an atom?

Atomic mass minus the atomic number.

How do you determine the number of protons in an atom?

Atomic number equal the proton number.

How do you determine the number of electrons in a neutral atom?

Electron number equals proton number in a neutral atom. Proton number equals the atomic number. Therefore, electron number can be determined by looking up the atomic number for the element on the periodic table.

What is the electrically charge of a electron?

Has a negative charge.

What is the electrical charge of proton?

Has a positive charged

What is the electrically charge of a neutron?

Has no charge.

Electron Cloud

Located outside of the nucleus. Electron are located here.

Where are neutrons located in the atom?

Nucleus

Where are protons located in an atom?

Nucleus

Where are electrons located in the atom?

Outside the nucleus in the electron cloud

Proton

Positively charged subatomic particle located in the nucleus of the atom. Mass is 1 a.m.u.

Atom

The basic building block of matter.

Element

The basic unit of matter that consists of one type of atom.

Nucleus of the Atom

The center of the atom. Location of protons and neutrons.

Valence electrons

The electrons that are in the outermost shell in the electron cloud. It is these electrons that form the chemical bonds between atoms in compounds.

Atomic Mass

The mass of the protons and neutrons in an atom.

Atomic Number

The number of protons in the nucleus of the atom.

Subatomic particles

Three particles: protons, neutrons, electrons

Matter

anything that has mass and takes up space.

Which energy level is filled first?

first ring (orbital, shell) nearest the nucleus.

How many electrons can fit in the third energy level?

up to 18 electrons

How many electrons can fit in the fourth, fifth, sixth, seventh energy level?

up to 32 electrons

How many electrons can fit in the second energy level?

up to 8 electrons


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