Atomic Structure Vocabulary

The smallest unit of an element that

maintains the properties of that element is called a(n) ____.

A substance that cannot be separated

or broken down into simpler substances by

chemical means is called a(n) _______.

A table in which the chemical elements are arranged in order of increasing atomic number. Elements with similar properties are arranged in the same column (called a group), and elements with the same number of electron shells are arranged in the same row (called a period).

The number of protons in the

nucleus of an atom; the ______ ______ is the

same for all atoms of an element

The mass of an atom expressed in

atomic mass units (amu) is call the ______ ____.

An atom that has the same number of

protons (or the same atomic number) as other

atoms of the same element do but that has

a different number of neutrons (and thus a

different atomic mass) is called a(n) _______.

Match each subatomic particle with the correct definition.

• Proton

• A subatomic particle that has a negative

  charge.

• Neutron

• A subatomic particle that has a positive

  charge and that is located in the nucleus of an

  atom.

• Electron

• A subatomic particle that has no charge

  and that is located in the nucleus of an atom.

A charged particle that forms when an atom

or group of atoms gains or loses one or more

electrons.

A positively charged ion is called a(n) ​ (a)  

A negatively charged ion is called a(n) ​ (b)  

• cation
• anion
• ion
• isotope

Which of the following models of an atom represent a Bohr model?

• A.

• B.

• C.

• D.

• E.

Tags

NGSS.MS-PS1-1