Unit 7: Atomic Structure and Periodic Table

All matter is made of what?

• energy

• atoms

• electrons

The positive particles of an atom are ___________.

• electrons

• protons

• neutrons

The center of an atom where its neutrons and protons are is called the _____________.

• nucleus

• electron cloud

• center

An atom with atomic number 6 would have how many protons?

• 6

• 12

• 3

Particles in an atom that are neutral and have no charge are

• protons

• electrons

• neutrons

True or False? Neutrons have a negative charge

• True
• False

What is the atomic number for an element with three protons?

• 6

• 1

• 3

A particle that moves around the nucleus is called an _________.

• Proton

• Neutron

• Electron

• Quark

In the modern periodic table elements are arranged by:

• atomic mass
• atomic number
• valence electrons
• number of isotopes

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion