Unit 3 Lesson 1: Modeling Atomic Structure

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 atomic number of this atom?

• 1

• 3

• 4

• 7

What is the mass number of this atom?

• 1

• 3

• 4

• 7

What does the 6 represent?

• Atomic mass

• atomic number

• chemical symbol

• element name

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

If an atom has 12 positively charged subatomic particles, which of the following must it also have to be considered a neutral atom?

• 12 neutrons
• 12 electrons
• 12 protons
• 24 protons and neutrons

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

• 20

• 10

• 35

• 25

An atom has an atomic number of 15 and a mass number of 31. How many protons are there in the atom?

• 15
• 31
• 16
• 47

Which of the following determines the identity of an element?

• number of protons

• atomic mass

• number of neutrons

• number of shells

How many electrons can the first energy level hold?

• 1
• 2
• 8
• 0