Unit 7 - History and Structure of the Atom

The atomic number identifies the number of __________.

• electrons

• atoms

• protons

• neutrons

Which atomic particle has a negative charge?

• proton
• neutron
• electron
• all of the above

Which of these phrases best describes an atom?

• a positive nucleus surrounded by a hard negative shell
• a positive nucleus surrounded by a cloud of negative charges
• a hard sphere with postive and negative charges on the outside
• a negative nucleus surrounded by protons and neutrons

Tags

NGSS.MS-PS1-1

What is true about an atom?

• Most of the space in an atom is taken up by the nucleus
• Atoms are mostly empty space
• Atoms have no mass
• Electrons have much more mass that protons or neutrons.

The positively charged parts of an atom are the

• protons
• electron clouds
• neutrons
• electrons

Matter that is made up on only one type of atom is called

• a compound
• a subatomic particle
• an element
• water

The term "neutral" means

• having only a little bit of charge
• having a positive charge
• having a negative charge
• having no charge at all

Tags

NGSS.MS-PS2-3

Atoms are neutral because they have the same number of

• protons and neutrons
• protons and electrons
• electrons and neutrons

Subatomic particles that are neutral in charge

• Neutrons
• Protons
• Nucleus 
• Electrons

Where electrons are likely to be found as they travel around the nucleus

• Nucleus
• Electron Cloud
• Within a Proton
• Within a Neutron