Atoms and Elements

oxygen

O

iron

fe

hydrogen

h

Atomic mass number

is the total number of protons and neutrons in an atomic nucleus.

sodium

na

nucleus

A cell structure that contains nucleic acids, the chemical instructions that directs all the cell's activities. The center of atom made of protons and neutrons.

element

Any substance that cannot be broken down into simpler substances. Its made of only one kind of atom.

aluminum

al

Plutonium (94 protons, 150 neutrons, 99 electrons)

atomic no. 94 mass no. 244 charge -5

An atom consists of three smaller particles: protons which have a positive one charge, electrons which have a negative one charge, and neutrons which have no charge and, therefore, are neutral.

An atom consists of three smaller particles: protons which have a positive one charge, electrons which have a negative one charge, and neutrons which have no charge and, therefore, are neutral.

An atom is made of three smaller particles: protons 1, An atom is made of three smaller particles: protons 1, electrons (e) which have a charge of negative one, and neutrons (n) which have 0 charge, and are therefore said to be neutral. The protons and neutrons held tightly together in the center of the atom, called the nucleus. The nucleus is a very tiny part of the whole atom. If an atom was the size of Houston Astrodome, the nucleus would be the size of a pea on the 50 yard line. Protons and neutrons are about 1,800 times more massive than electrons which, in comparison, are like little bits of fluff.

An atom is made of three smaller particles: protons 1, An atom is made of three smaller particles; protons 1, electrons (e) which have a charge of negative one, and neutrons (n) which have 0 charge, and are therefore said to be neutral. The protons and neutrons held tightly together in the center of the atom, called the nucleus. The nucleus is a very tiny part of the whole atom. If an atom was the size of Houston Astrodome, the nucleus would be the size of a pea on the 50 yard line. Protons and neutrons are about 1,800 times more massive than electrons which, in comparison, are like little bits of fluff.

Atoms are like the building blocks of matter in the universe because different kinds of atoms can be combined in many ways to form compounds.

Atoms are like the building blocks of matter in the universe because different kinds of atoms can be combined in many ways to form compounds.

Carbon, oxygen, and gold are examples of pure substances called elements. They are made of very tiny particles called atoms.

Carbon, oxygen, and gold are examples of pure substances called elements. They are made of very tiny particles called atoms.

Chemical symbols are a shorthand way of representing the elements. Each symbol consists of one or two letters, usually taken from the element's name.

Chemical symbols are a shorthand way of representing the elements. Each symbol consists of one or two letters, usually taken from the element's name.

Elements are the simplest pure substance. An element cannot be changed into a simpler substance by heating or by any chemical process.

Elements are the simplest pure substance. An element cannot be changed into a simpler substance by heating or by any chemical process.

If you were to cut a sample of gold into smaller and smaller pieces of gold, eventually you would reach the smallest piece of gold called an atom of gold. If you were to cut this tiny particle any further, would the resulting particles still have the properties of gold? No.

If you were to cut a sample of gold into smaller and smaller pieces of gold, eventually you would reach the smallest piece of gold called an atom of gold. If you were to cut this tiny particle any further, would the resulting particles still have the properties of gold? No.

Scientists now know that an atom is made of even smaller particles. These particles, however, do not have the properties of the elements they make up.

Scientists now know that an atom is made of even smaller particles. These particles, however, do not have the properties of the elements they make up.

The Periodic Table of the Elements is a chart which lists all the elements and information about them. It is arranged in order of increasing atomic number. The elements into families whose members all have similar properties.

The Periodic Table of the Elements is a chart which lists all the elements and information about them. It is arranged in order of increasing atomic number. The elements into families whose members all have similar properties.

The center of an atom is very tiny and hard. It is called the nucleus. In it are protons and neutrons that are held tightly together by the strong force.

The center of an atom is very tiny and hard. It is called the nucleus. In it are protons and neutrons that are held tightly together by the strong force.

The electrons move around the nucleus like a cloud of negative electricity. They can move anywhere around the nucleus but they tend to be found in certain regions and more often than other regions. Electrons are much less massive than protons and neutrons but take up a lot of space. Therefore, the atom is mostly empty space.

The electrons move around the nucleus like a cloud of negative electricity. They can move anywhere around the nucleus but they tend to be found in certain regions and more often than other regions. Electrons are much less massive than protons and neutrons but take up a lot of space. Therefore, the atom is mostly empty space.

The electrons move in the space around the nucleus. They can move anywhere and don't travel in set orbits, like planets. They do, however tend to be found in certain regions around the nucleus more often than in others. This model of the atom is nicknamed the electron clouds model because the electrons seem to form "clouds" of negative electricity around the tiny, hard nucleus. Therefore, the atom is mostly empty space.

The electrons move in the space around the nucleus. They can move anywhere and don't travel in set orbits, like planets. They do, however tend to be found in certain regions around the nucleus more often than in others. This model of the atom is nicknamed the electron clouds model because the electrons seem to form "clouds" of negative electricity around the tiny, hard nucleus. Therefore, the atom is mostly empty space.

The number of protons in an atom is called its atomic number. The number of the atom's protons added to the number of its neutrons is called the atom's mass number.

The number of protons in an atom is called its atomic number. The number of the atom's protons added to the number of its neutrons is called the atom's mass number.

Two letters are needed for a chemical symbol when the first letter of that element's name has already been used as a symbol for another element.

Two letters are needed for a chemical symbol when the first letter of that element's name has already been used as a symbol for another element.

What is the name of the chart that lists all the elements? The Periodic Table of the Elements.

What is the name of the chart that lists all the elements? The Periodic Table of the Elements.

The number of protons in an atom is very important because it determines the number of electrons moving around the nucleus. The number of protons in an atom is called its atomic number. Each element has atoms with a specific number of protons (atomic number); therefore, JT ha the number of protons in an atom that determines the type of atom it is. The simplest of all atoms, the hydrogen atom, has only one proton. The element whose atoms all have two protons is helium. The largest naturally occurring atom is radium. It has an atomic number of 92. There are about 118 different kinds of atoms (i.e., different elements) discovered or created by scientists. An atom always has the same number of electrons as protons, making atoms electrically neutral. Atoms of the same kind, with the same atomic number, can have different numbers of neutrons. Since the two heavy particles in an atom are the protons and neutrons, almost all of the atom's mass is in its nucleus. The atomic mass number is the number of protons and neutrons in the mass.

The number of protons in an atom is very important because it determines the number of electrons moving around the nucleus. The number of protons in an atom is called its atomic number. Each element has atoms with a specific number of protons (atomic number); therefore, JT ha the number of protons in an atom that determines the type of atom it is. The simplest of all atoms, the hydrogen atom, has only one proton. The element whose atoms all have two protons is helium. The largest naturally occurring atom is radium. It has an atomic number of 92. There are about 118 different kinds of atoms (i.e., different elements) discovered or created by scientists. An atom always has the same number of electrons as protons, making atoms electrically neutral. Atoms of the same kind, with the same atomic number, can have different numbers of neutrons. Since the two heavy particles in an atom are the protons and neutrons, almost all of the atom's mass is in its nucleus. The atomic mass number is the number of protons and neutrons in the mass.

The smallest particle of an element that has the properties of that element is called an atom. An atom is the basic building block of matter. All elements are made of atoms. Atoms of the same element are alike. Atoms of different elements are different.

The smallest particle of an element that has the properties of that element is called an atom. An atom is the basic building block of matter. All elements are made of atoms. Atoms of the same element are alike. Atoms of different elements are different.

The smallest piece of an element is called an atom. Atoms are extremely tiny. It would take a stack of 50,000 aluminum atoms to equal the thickness of a piece of aluminum foil. A penny contains about 20 billion atoms!

The smallest piece of an element is called an atom. Atoms are extremely tiny. It would take a stack of 50,000 aluminum atoms to equal the thickness of a piece of aluminum foil. A penny contains about 20 billion atoms!

atom

The smallest unit of an element. It is made of proton, neutrons, and electrons

There are about 118 different kinds of atoms that are found in nature or that have been made in science laboratories. Each different type of atom is an element.

There are about 118 different kinds of atoms that are found in nature or that have been made in science laboratories. Each different type of atom is an element.

radon (86 protons, 136 neutons, 81 electrons)

atomic no. 86 mass no. 222 charge +5

You should note that when two letters are used in a symbol, the first letter is always capitalized but the second letter is never capitalized.

You should note that when two letters are used in a symbol, the first letter is always capitalized but the second letter is never capitalized.

atomic number

a chemical is the number of protons found in the nucleus of an atom. The number of protons

calcium (20 protons, 20 neutrons, 17 electrons)

atomic no. 20 mass no. 40 charge +3

Silver (47 protons, 61 neutrons, 49 electrons

atomic no. 47 mass no. 108 charge -2

bismuth (83 protons, 126 neutrons, 99 electrons)

atomic no. 83 mass no. 209 charge 0

gold

au

bromine

br

carbon

c

calcium

ca

copper

cu

phosphorus

p

sulfur

s