The Structure of Atoms

A positively charged particle in the nucleus of an atom is a _____.

• electron

• neutron

• proton

An ____ is one of two or more different-number-neutron atoms of an element.

• nucleus

• ion

• isotopes

An element’s atomic number tells how many ______ are in the nucleus of an atom of that element.  

• protons

• neutrons

• electrons

A negatively charged particle that occupies the space in an atom outside the nucleus is an ______.

• electron

• neutron

• proton

A uncharged particle in the nucleus of an atom is a _____.

• electron

• neutron

• proton

The region at the center of an atom's _______.

• nucleus

• ion

• isotopes

True or False: An atom’s electron cloud is located in the region surrounding the nucleus.

• True

• False

An atom that has a positive or negative charge is an _________.

• nucleus

• ion

• isotopes

What is shown here?

• two different isotopes

• two different ions

• two different elements

True or False: An element’s atomic number tells how many protons are in the nucleus of an atom of that element. 

• True

• False