ATOMS mass Matter is anything that has What

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ATOMS

ATOMS

mass Matter is anything that has _______ What is all this? space and takes

mass Matter is anything that has _______ What is all this? space and takes up ____. Matter trees air bear rocks soil water

All matter is composed of ______. elements There are many ________. different elements

All matter is composed of ______. elements There are many ________. different elements

atoms Elements are composed of ______. smallest particle of an element An atom is

atoms Elements are composed of ______. smallest particle of an element An atom is the______________ that retains the chemical identity of the element

Example: is an element There are. Aluminum many different elements. .

Example: is an element There are. Aluminum many different elements. .

Imagine you had super powers…. . and you are able to cut the tiniest

Imagine you had super powers…. . and you are able to cut the tiniest piece of aluminum and still have aluminum… you would have one atom of aluminum. Aluminum, Al Cut…cut One atom of aluminum, you have the element aluminum.

How big is an atom? Atoms are extremely small. A piece of aluminum foil

How big is an atom? Atoms are extremely small. A piece of aluminum foil contains billions of atoms of aluminum. Aluminum foil is about 200, 000 atoms thick! WOW, that’s small!

Aluminum, Al Every atom of aluminum is identical. Atoms of the same element are

Aluminum, Al Every atom of aluminum is identical. Atoms of the same element are identical.

The atoms of different elements are different! An atom of helium An atom of

The atoms of different elements are different! An atom of helium An atom of beryllium

How are these atoms different? How are these atoms similar? An atom of helium

How are these atoms different? How are these atoms similar? An atom of helium An atom of beryllium

There are many different atoms but all atoms are made up of the same

There are many different atoms but all atoms are made up of the same type of subatomic particles.

Atoms are made of three kinds of subatomic particles: Protons are __________subatomic positively charged

Atoms are made of three kinds of subatomic particles: Protons are __________subatomic positively charged (+1) particles found in the ____. nucleus Neutrons are ______ neutral (0) subatomic particles found in the _____. nucleus charged (-1) Electrons are negatively __________subatomic particles that __________. orbit the nucleus

An Atom proton neutron electron nu cle us

An Atom proton neutron electron nu cle us

Mass of an electron = 9. 11 x 10 -28 g Mass of a

Mass of an electron = 9. 11 x 10 -28 g Mass of a proton = 1. 673 x 10 -24 g Mass of a neutron = 1. 675 x 10 -24 g

Protons and neutrons have the same mass. Electrons have very little mass when compared

Protons and neutrons have the same mass. Electrons have very little mass when compared to protons and neutrons. An electron is 1/1840 the mass of a proton. Each proton has a mass of about 1840 times that of an electron. Comparison: elephant : : chihuahua

Therefore, most of the mass of an atom is in the nucleus(99. 97%). As

Therefore, most of the mass of an atom is in the nucleus(99. 97%). As a result, the atom consists of mostly empty space with an extremely small solid nucleus. The nucleus is the area in the center of the atom that contains protons and neutrons (positive charge).

Generally, particles that have the same electric charge repel each other. Not so for

Generally, particles that have the same electric charge repel each other. Not so for protons. When two protons are extremely close to each other, there is a strong attraction between them. These short-range force of attraction between proton-proton, neutron-neutron, and proton-neutron are called nuclear forces.

Dalton’s Atomic Theory (1808): 1. All matter is composed of extremely small particles called

Dalton’s Atomic Theory (1808): 1. All matter is composed of extremely small particles called atoms. 2. All atoms of a given element are identical. The atoms of any one element are different from those of any other element. 3. Atoms cannot be created, divided into smaller particles, or destroyed. 4. Different atoms combine in simple whole-number ratios to form compounds. 5. Chemical reactions occur when atoms are separated, joined, or rearranged.