Atomic Structure and Element Assignment

Determine the atomic number, mass number, number of protons, neutrons, and electrons for a neutral atom of potassium-39.

• Atomic # 19

  Mass # 39

  Protons 19

  Neutrons 20

  Electrons 19

• Atomic # 19

  Mass # 39.098

  Protons 19

  Neutrons 19

  Electrons 19

• Atomic # 39

  Mass # 19

  Protons 39

  Neutrons 19

  Electrons 39

• Atomic # 19

  Mass # 39.098

  Protons 19

  Neutrons 20

  Electrons 19

Tags

NGSS.MS-PS1-1

Isotopes have the same number of ____, but different number of ____.

• neutrons; protons

• protons; electrons

• protons + electrons; neutrons

• electrons; protons

In a neutral atom what two subatomic particles are equal?

• Neutrons + Protons

• Electrons + Neutrons

• Protons + Electrons

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

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

Tags

NGSS.MS-PS1-1

Which subatomic particle determines the identity of an element?

• protons

• neutrons

• electrons

Which subatomic particle determines the charge of an atom?

• protons

• neutrons

• electrons

What is the number of protons that the element in this image contain?

• 14
• 7
• 15
• 18

Tags

NGSS.MS-PS1-1

Carbon

• CA

• C

• Ca

• Cn

Tags

NGSS.MS-PS1-1

Sn

• tin

• sulfur

• iron

• sodium

Tags

NGSS.HS-PS1-1

Zinc

• Z

• Zi

• ZN

• Zn