Atomic structure

What is the atomic number of an atom?

• The number of protons
• the number of neutrons

What is the mass number of an atom?

• The number of neutrons
• The number of protons + neutrons
• The number of protons + electrons

How are the electrons arranged in atoms?

• In the nucleus
• In shells around the atom
• Randomly around the nucleus

Tags

NGSS.MS-PS1-1

How many electrons can go in the first shell?

• 1
• 2
• 3
• 4

How many electrons can go in the second and third shells?

• 2
• 4
• 6
• 8

What are groups in the periodic table?

• The left and right "rows"
• the up and down "columns"

Tags

NGSS.HS-PS1-2

What can the group tell you about the electrons in an atom?

• How many electrons there are in total
• How many electrons are in the first shell
• How many electrons are on the outer shell

Tags

NGSS.HS-PS1-1

What are periods in the periodic table?

• The left and right "rows"
• the up and down "columns"

What can the period tell you about the electrons in an atom?

• How many electrons there are in total
• How many electrons are in the first shell
• How many electron shells there are

Tags

NGSS.HS-PS1-1

How many electrons does calcium have?

• 30
• 22
• 40
• 20

Tags

NGSS.HS-PS1-1