Atoms

The atomic mass is the

• number of protons and neutrons inside the nucleus

• number or electrons or protons

• number of protons, neutrons and electrons

The atomic mass is the

• number of protons and neutrons inside the nucleus

• number or electrons or protons

• number of protons, neutrons and electrons

All matter is made of _________.

• energy 
• atoms 
• electrons 
• compounds 

If an atom has 3 electrons, how many protons does it have?

• 1
• 2
• 4
• 3

The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

A vertical column is called...

• group
• tower
• period
• crew

What did Dmitri Mendeleev invent?

• Chemistry

• Periodic Table

• Atoms

• Calculator

What is at the center of every atom?

• An electron
• A compound
• A molecule
• A nucleus

The positively charged particles of an atom are the ________.

• electrons
• protons
• neutrons
• protons & neutrons

The particles with no charge in an atom are the _______.

• electrons
• neutrons
• protons
• protons and neutrons