Neutral Atoms

What is the atomic number of aluminum-27?

• 27

• 13

• 14

• 25

What is the mass number of aluminum-27?

• 27

• 13

• 14

• 25

The atomic number is ___.

• equal to the number of protons in an atom

• found by adding protons and neutrons

• found by adding protons and electrons

• equal to the number of neutrons in the atom

How many neutrons are in the isotope shown here?

• 1

• 2

• 3

• 0

Tags

NGSS.HS-PS1-8

Mass number is equal to

• the number of protons

• protons + electrons

• protons - neutrons

• protons + neutrons

• the number of electrons

Tags

NGSS.HS-PS1-8

What is the atomic number of this atom?

• 1
• 3
• 4
• 7

Tags

NGSS.MS-PS1-1

What is the mass number of this atom?

• 1

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

How many neutrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

How many electrons does the isotope of lithium have?

• 8
• 3
• 4
• 5

Tags

NGSS.MS-PS1-1

In a correctly written symbol what would be located in the "A" position?

• number of neutrons
• atomic number
• number of electrons 
• mass number

Tags

NGSS.MS-PS1-1