2.1 - The Nature of Matter

What is the atomic number?

• the number of protons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of neutrons in the nucleus

• the number of protons in the energy levels

What is the mass number?

• the number of protons in the nucleus

• the number of protons and neutrons in the nucleus

• the number of neutrons in the nucleus

• the number of protons and electrons in the atom

What is the atomic number of this atom?

• 1

• 3

• 4

• 7

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Most of the mass in an atom is made up of _____________________?

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

In order for an atom to be neutral what has to be true?

• The atom has more protons than neutrons
• The atom has more neutrons than protons
• The atom has the same number of protons and neutrons
• The atom has the same number of protons and electrons

What does the C represent?

• atomic mass
• atomic number
• element name
• chemical symbol 

What subatomic particles would you find in the nucleus of an atom?

• Protons only
• Protons and Neutrons
• Neutrons and Electrons
• Protons and Electrons 

An atom has 10 protons, 15 neutrons and 10 electrons what is its mass number.

• 20

• 10

• 35

• 25

How many electrons does this atom have?

• 2

• 4

• 6

• 10