Unit 2 Review

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 is made up of protons, neutrons, and electrons.  Which is the smallest subatomic particle?

• Proton
• Neutron
• Electron
• Idontknowatron

In the modern periodic table elements are arranged by:

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

Which is an electron?

• A
• B
• C

How many electrons does Si contain? (click to see image)

• 14
• 28
• 2
• 4

What is the mass number and name of an element with 8 protons and 8 neutrons?

• 16 - Carbon
• 16 - Oxygen
• 24 - Oxygen
• 8 - Neon

USE THE PERIODIC TABLE

How many valence electrons does Phosphorus have?

• 31

• 5

• 15

• 4

Which part of an atom has no charge?

• Proton

• Neutron

• Electron

• None of them

Using the picture from a periodic table, what is the Atomic Number?

• 26

• Fe

• 55.845

• 56