Chemical Elements and Atoms

What is true about an element?

• there are no pure elements

• an atom is the smallest part of an element

• elements may be broken into smaller parts than atoms.

• all elements look the same

Subatomic particles include all of the following except:

• protons

• neutrons

• atoms

• electrons

The presence of atoms can be verified by ____and chemical reactions

• gamma rays

• x- rays

• microwaves

The nucleus of an atom contains the ______.

• Protons and Neutrons

• Neutrons and Electrons

• Protons and Electrons

The space surrounding the nucleus of an atom is where the ________are located

• protons

• neutrons

• electrons

Electrons travel at slow speeds.

• true

• false

The planetary model is also known as the model

• Bohr

• Simplified

• electron cloud

The electron cloud model shows the probability of where an electron is at any given moment.

• true

• false

Substances that are made from just one type of atom are elements.

• true

• false

The smallest building block of an element is:

• an atom

• an electron

• a nucleus

• an element