CK-12 4.1 Atoms

scanning tunneling microscope

The only microscope that can make images of things as small as atom.

What is proton?

Subatomic Particles which has a positive electric charge.

What is nucleus?

The dense area at the center is called the nucleus. Where all the protons and neutrons are clustered closely together.

Size of Atoms

Atoms are extremely small. The radius of an atom is under 1 nanometer, which is one-billionth of a meter.

Which element I has the biggest atom? (From what we have learned)

Cesium (CS)

The radius of an atom is closest in size to a ___________.

Nanometer

What do all atoms of the same electrons have in common

Number of protons

A neutral atom has equal numbers of _____ and electrons.

Protons

Three main types of particle that make up all atoms are

Protons, electrons, and neutrons

Elements

Pure Substances- such as nickel, hydrogen, and helium- that make up all kinds of matter.

All Atoms of carbon have six protons. How many electrons do carbon atoms have?

Six electrons

What is true about the atoms of any element?

All the atoms of a given element are identical in that they have the same number of protons.

What is all matter made of?

Atoms

What are Atoms?

Atoms are building block of matter. They are the smallest particles of an element that still have element's properties.

All atoms are about the same size. (True of False)

False

Atoms are the smallest particles in the universe. (True of false)

False

Protons are neutrons repel each other and position themselves far apart inside the atom. (True or False)

False

What does electrons do?

They constantly move around the nucleus.

Atoms are made of specific numbers of protons and electrons but the number of neutrons they possess can vary a little bit. (True of False)

True

In a neutral atom, the number of protons is equal to the number of electrons. (True of False)

True

The number of protons determines what type of element and atom is. (True or False)

True

What is neutrons?

Which are neutral in electric charge.

What is electrons?

Which have a negative electric change.

What is contained in the nucleus of an atom?

protons and neutrons